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"discolour" Definitions
  1. to change colour, or to make the colour of something change, in a way that makes it look less attractive

48 Sentences With "discolour"

How to use discolour in a sentence? Find typical usage patterns (collocations)/phrases/context for "discolour" and check conjugation/comparative form for "discolour". Mastering all the usages of "discolour" from sentence examples published by news publications.

The lighter the rings are, the faster this will happen, for the less mass they contain, the less celestial pollution they can absorb before they start to discolour.
If the flavour of thyme be agreeable, you may put in a little, but take care that it does not boil in it long enough to discolour the soup.
These days, we have ways to make fuel and soap without killing any endangered animals, and so the degreasing process just gets the oil out of the bones so it doesn't drip on people while they walk underneath the skeleton or discolour the bones over time.
In Dorset Peak stones were used for farm meal and barley crushing. The local gritstone tended to discolour bread, so were not generally used to grind wheat.
Discharges can also discolour the water leading to reduced aesthetics. This has happened with the Tarawera River in New Zealand which subsequently became known as the "black drain".
Preserved specimens generally discolour to yellow or tan. The Pacific blue-eye can be distinguished from the highly invasive and noxious introduced eastern mosquitofish (Gambusia holbrooki) by its forked tail fin.
Loss of habitat has been listed as one of the major threats to the Grey-crowned Babbler (P. temporalis), Painted Honeyeater (G. picta), the Regent Honeyeater (X. phrygia), and the Swift Parrot (L. discolour).
Eastern bristlebird (Dasyornis brachypterus brachypterus) Eastern bristlebird (Dayornis brachypterus brachypterus), swift parrot (Lathamus discolour), powerful owl (Ninox strenua), sooty owl (Tyto tenebricosa), olive whistler (Pachycephala olivacea), regent honeyeater (Xanthomyza Phrygia), turquoise parrot (Neophema pulchella) and the Australian masked owl (Tyto novaehollandiae).
Although watercolour frisket can be removed by rubbing with the fingers, doing so has the disadvantage of potentially transferring skin oils which can discolour the artwork, or otherwise affect subsequent applications of watercolours or other mediums such as chalk, ink, etc.
Agaricus xanthodermus belongs to a group of related species (the "Xanthodermatei") which likewise discolour bright yellow and have a phenolic smell. They include A. praeclaresquamosus (formerly A. placomyces) which has dark grey scales, A. moelleri, and A. pilatianus, which does not have a bulbous stem.
The native Noisy Miner (Manorina melanocephala), Red Wattlebird (Anthochaera carunculata) and the Noisy Friarbird (Philemon corniculatus), whose populations have spread due to habitat fragmentation are a threat to the Swift Parrot (L. discolour), the Painted honeyeater (G. picta) and the Regent honeyeater (X. phrygia) through competitive exclusion.
In central and northern Europe and Asia the clutch size is around 12, whereas it is around four in the tropics and seven in the subtropics. The eggs are round and milky blue when laid, but quickly discolour in the increasingly dirty nest. They weigh . A replacement clutch is possible.
The mine is found only in the younger leaves, and is pale green in colour, the tips of the branches often being white, showing where the larva came close against the upper cuticle. Old mines become white, but otherwise do not discolour the leaf. The frass is very finely granular.
The fruit bodies of Skeletocutis are annual to perennial. They are resupinate (crust-like) to pileate (that is, with a cap). When caps are present, their colour is typically white, cream-pink, or lilac, although the fruit body tends to discolour somewhat when dry. The pores are small and round to irregular in shape.
"Purging the System." LNG Industry Autumn (2012). Print. Purge gases must be of a certain quality, in order that the welds are made correctly. Because welds in Argon or Helium which have more than 0.05% (500 ppm) of oxygen will oxidise and discolour, welding engineers will include the mention of the correct gas quality in their welding procedures.
One-component silicones are mostly used as a binding agent for sealants and require atmospheric moisture to harden. During the hardening process either acetic acid or ethanol is set free. Akemi provides special, ready-made silicones for natural stone and guarantees that they do not discolour. These silicones are permanently elastic and as such are suitable for use in the construction industry.
Bronze is used to make bronze wool for woodworking applications where steel wool would discolour oak. Phosphor bronze is used for ships' propellers, musical instruments, and electrical contacts.Resources: Standards & Properties – Copper & Copper Alloy Microstructures: Phosphor Bronze Bearings are often made of bronze for its friction properties. It can be filled with oil to make the proprietary Oilite and similar material for bearings.
The white flesh of the entire fungus does not discolour when damaged, and is soft—particularly in mature specimens. It has a "pleasant" taste and lacks any distinctive odour. The spore print is ochre or clay coloured, the elongated elliptical spores measuring 7–10 by 3–3.5 μm. Basidia (spore-producing cells) are four spored, with dimensions of 14–18 by 4–5 μm.
Saintpaulia, propagation is readily done from leaf cuttings that are best taken in spring and early summer. Any sterile medium may be used provided it is well drained. The tips of the leaves will discolour and break off along abscission lines if stressed by cold or prolonged drought, though overwatering will encourage fungal growth.PlantZAfrica.com Streptocarpus rhizomes show the presence of sterols, organic acids and phenols.
The fruiting bodies of Agaricus augustus are large and distinctive agarics. The cap shape is hemispherical during the so-called button stage, and then expands, becoming convex and finally flat, with a diameter of up to . The cap cuticle is dry, and densely covered with concentrically arranged, brown- coloured scales on a white to yellow background. The flesh is thick, firm and white and may discolour yellow when bruised.
The reserve lies on the south coast of Little Cayman, near the western end of the island. It comprises a 43 ha seasonally flooded hypersaline lagoon with a fringe of mangroves and a strip of dry forest on its northern side. The forest is dominated by Bursera simaruba, Canella winterana, Coccothrinax procterii, Ficus aurea, Guipera discolour, Myrcianthus fragrans and Plumeria obtusa, while the mangroves are intermixed with Thespesia populnea and Cordia sebestena var. caymanensis.
The young disperse during the February and March of the following year to establish their own territories. They are opportunistic raptors, which prey on arboreal or semi-arboreal marsupials, including gliders and possums. The Box-ironbark ecological vegetation class is also habitat to the Swift Parrot (Lathamus discolour) during the winter months. The Swift Parrot arrives on mainland Australia between January and May, when it spends the winter in the box-ironbark forests feeding on the nectar of winter flowering Mugga Ironbark (E.
Cadaghi is a fast growing tree that has been used as a street and garden tree further south than its natural range, including in inland towns such as Narrabri, Chinchilla and Cunnamulla. Its dense canopy of large leaves can provide shade in these places. A sooty fungus that often grows on the tree can discolour objects underneath it. Large branches can sometimes break off and there are serious environmental problems caused by this species in coastal and near-coastal areas.
Fragile items and sharp edges will be dulled or damaged from colliding with other items and/or thermal stress. Sterling silver and pewter will oxidize and discolour from the heat and from contact with metals lower on the galvanic series such as stainless steel. Pewter has a low melting point and may warp in some dishwashers. Glued items, such as hollow-handle knives or wooden cutting boards, will melt or soften in a dishwasher; high temperatures and moisture damage wood.
It was designed by Nell Wilson. In 1990, disease was found on the kangaroo paw plant in Okinawa. The unreported fungi, which associated the plant becoming very limp and wilt, was characterised by a discolouration of the plant leaving it a brown to black colour around the stalks, leaves and base of the plant. As the plant began to discolour over time, white cottony mycelia started to appear at the surface of the lesions and then the plant eventually died.
Unidentified species of mildew growing on a plastic shower curtain (scale gradations = 11 µm) The term mildew is often used generically to refer to mould growth, usually with a flat growth habit. Moulds can thrive on many organic materials, including clothing, leather, paper, and the ceilings, walls and floors of homes or offices with poor moisture control. Mildew can be cleaned using specialised mildew remover, or substances such as bleach (though they may discolour the surface). There are many species of mould.
Cerulean blue PB35 A sample swatch of cerulean blue hue oil paint. 'Hue' in this case means that other pigments have been used to mimic the hue of oil paint containing the original pigment. In classical times, the word caerulum was used to describe blue pigments, particularly mixtures of copper and cobaltous oxides, like azurite and smalt. These early attempts to create sky blue colours were often less than satisfactory due to a limited saturation and the tendency to discolour in reaction with other pigments.
When the trolley reached the aerial gallery it had to be disconnected from the rails and swung out to attach to the cables. In August 2003, the tower was painted an ultramarine blue to cover the existing light brown which had started to discolour. The balconies were painted a dark shade of blue. On 18 March 2004, local comedian Jasper Carrott switched on the night-time illuminations of the tower in response to Birmingham City Council's policy of encouraging the illumination of local landmarks.
Ilfochrome (also commonly known as Cibachrome) is a dye destruction positive- to-positive photographic process used for the reproduction of film transparencies on photographic paper. The prints are made on a dimensionally stable polyester base as opposed to traditional paper base. Since it uses 13 layers of azo dyes sealed in a polyester base, the print will not fade, discolour, or deteriorate for an extended time. Accelerated aging tests conducted by Henry Wilhelm rated the process as producing prints which, framed under glass, would last for 29 years before color shifts could be detected.
The stem is cylindrical, clavate or ventricose, high by wide, cream to pale yellow, but typically lemon-yellow at the apex and usually narrowing at the base. It has no reticulation (net), but is covered in tiny pustules (scabrosities) below the apex, sometimes browning with age. The tubes are pale yellow to lemon-yellow and usually do not discolour when cut, but may rarely stain faintly greenish-brown. The pores are small and rounded, lemon-yellow to chrome-yellow, not discolouring or rarely staining greenish-brown where handled or injured.
This large remnant of native vegetation, amongst productive farmland, forms part of the important feeding area for Swift parrots (Lathamus discolour) when they leave Tasmania each winter, for the mainland, in search of nectar and lerp insects.Saunders, D.L. and Tzaros, C.L. 2011. National Recovery Plan for the Swift Parrot Lathamus discolor, Birds Australia, Melbourne. The small population (less than 2500 individuals) has a huge area (1 250 000 km²) and shows potential for site fidelity, or repeat visitation, meaning sites like Livingstone National Park, are vital areas for conserving this species.
This may explain some of the discrepancies. The green parrots mentioned could also instead have been storm-blown members of Psittacula species from other islands, that survived on Rodrigues for a short time. The two existing specimens were originally preserved in alcohol, but though this can discolour specimens, it is not probable that it could turn green to blue. Hume and Hein van Grouw have also suggested that due to an inheritable mutation, some Newton's parakeets may have lacked psittacin, a pigment that together with eumalanin produces green colouration in parrot feathers.
This is done with small pliers, tweezers, and custom-made jigs. The cloisonné wire pattern may consist of several intricately constructed wire patterns that fit together into a larger design. Solder can be used to join the wires, but this causes the enamel to discolour and form bubbles later on. Most existing Byzantine enamels have soldered cloisons, however the use of solder to adhere the cloison wires has fallen out of favor due to its difficulty, with the exception of some "purist contemporary enamellists" who create fine watch faces and high quality very expensive jewelry.
The endangered swift parrot (Lathamus discolour) has been recorded in the park during their migration from Tasmania between March and October. This species returns to foraging sites depending on food availability and available habitat in tree hollows. The critically endangered regent honeyeater (Anthochaera Phrygia) has been sighted in the park. Regent honeyeater range has contracted significantly in recent times and they face a significantly high risk of extinction in the near future The regent honeyeater is a flagship species whose conservation benefits a wide variety of other threatened and vulnerable woodland fauna.
Prolonged exposure to direct sunlight may also discolour or dehydrate turquoise. Care should therefore be taken when wearing such jewels: cosmetics, including sunscreen and hair spray, should be applied before putting on turquoise jewellery, and they should not be worn to a beach or other sun-bathed environment. After use, turquoise should be gently cleaned with a soft cloth to avoid a buildup of residue, and should be stored in its own container to avoid scratching by harder gems. Turquoise can also be adversely affected if stored in an airtight container.
This is done to prevent growth of mold or algae which could damage the plants and discolour the sides of the terrarium. Terraria must also be watered occasionally, the absence of condensation on the walls of the terrarium or any wilting of the plants is an indicator that the terrarium requires water. Closed terraria also require a special soil mix to ensure both good growing conditions and to reduce the risks of microbial damage. A common medium used is 'peat-lite', a mixture of peat moss, vermiculite, and perlite.
The video for "Don't You Wanna be Relevant?" features an animated version of the band playing the song, alongside some people dancing to their music. The viewer sees Ryan experience his heart exploding, which goes on affect everyone else in the video, as they in turn disintegrate, teeth fall out and discolour, and insects infest their bodies. The three band members follow suit and fall apart at the end. "Our Bovine Public" features footage from a short UK tour undertaken in early 2007, documented in the Leave Too Neat film that came with some editions of Men's Needs, Women's Needs, Whatever.
The porcelain on crowns should be expected to discolour, fracture or require repair approximately every ten years, although there is significant variation in the service life of dental crowns based on the position in the mouth, the forces being applied from opposing teeth and the restoration material. Where implants are used to retain a complete denture, depending on the type of attachment, connections need to be changed or refreshed every one to two years. An oral irrigator may also be useful for cleaning around implants. The same kinds of techniques used for cleaning teeth are recommended for maintaining hygiene around implants, and can be manually or professionally administered.
Effect of UV exposure on polypropylene rope Common synthetic polymers that can be attacked include polypropylene and LDPE, where tertiary carbon bonds in their chain structures are the centres of attack. Ultraviolet rays interact with these bonds to form free radicals, which then react further with oxygen in the atmosphere, producing carbonyl groups in the main chain. The exposed surfaces of products may then discolour and crack, and in extreme cases, complete product disintegration can occur. In fibre products like rope used in outdoor applications, product life will be low because the outer fibres will be attacked first, and will easily be damaged by abrasion for example.
Effect of UV exposure on polypropylene rope Common synthetic polymers that can be attacked include polypropylene and LDPE, where tertiary carbon bonds in their chain structures are the centres of attack. Ultraviolet rays interact with these bonds to form free radicals, which then react further with oxygen in the atmosphere, producing carbonyl groups in the main chain. The exposed surfaces of products may then discolour and crack, and in extreme cases, complete product disintegration can occur. In fibre products like rope used in outdoor applications, product life will be low because the outer fibres will be attacked first, and will easily be damaged by abrasion for example.
An upper-middle-class woman who goes into a state of shock in various, seemingly innocuous situations. For example: after receiving a phone call from her husband's European personal assistant, she must tell her children that "Daddy hasn't been able to find any good brie" on his business trip to France. They fear that they will be mocked at the Parisian picnic at school because they lack the correct cheese. Another time, she panics at the thought of having to use a dishwasher when an egg cleaver falls onto the floor, meaning that her daughter Chloe cannot open her egg and it cannot breathe and may discolour.
At this time the 'Waterloo' copper-bodied extinguisher was introduced-it was claimed that the copper did not discolour the water, and prevented staining of tapestries and oil painting in art galleries and Museums. The 'Tetra' and 'Roc-Tetra' carbon tetrachloride hand pump for vehicles was introduced in 1927 and adopted by the RAC for use on vehicles in its Road Service fleet. An article in the 'Evening Chronicle' appeared in 1928 stated that it was a legal necessity for motorists to have their garages equipped with fire extinguishers or to empty their petrol tanks each time they put their cars away. In 1929 the Duke of York's household was protected by Read and Campbell extinguishers and precise instructions on fire drill procedure were printed.
In the 18th century selective breeding of white common ducks led to a white domestic duck, generally known as the English White. Since at least the 1690s ducks had been farmed in Aylesbury, and raising English Whites became popular in Aylesbury and the surrounding villages. By 1813 it was remarked that "ducks form a material article at market from Aylesbury and places adjacent: they are white, and as it seems of an early breed: they are bred and brought up by poor people, and sent to London by the weekly carriers". The duck farmers of Aylesbury went to great lengths to ensure the ducks retained their white colouring, keeping them clear of dirty water, soil with a high iron content and bright sunlight, all of which could discolour the ducks' feathers.
As previously mentioned, the paint/stain layer may suffer as the result of deterioration within the fabric of the glass itself; however, this fragile layer is at risk for other types of damage as well. Painted surfaces that would have been applied to glass cold and fired on, are especially vulnerable to damage from condensation or weathering if they were fired improperly during the production process (Vogel 2007, 7). This is often the case with the fading or disappearance of fine detail, such as faces, in figural stained glass art (fig. 2). Over time, enamels can begin to flake off of glass panels, and certain types or colours of stains can discolour with continued UV exposure, all of which significantly alters the aesthetic impact of the work as a whole (Brown et al.
The cover of the Ooh La La album is designed around a stylised photograph of "Gastone", a stage character of 1920s Italian comedian Ettore Petrolini. The original LP's art deco-inspired cover was constructed in such a way that when the top edge of the sleeve was pressed down, a concealed die-cut design element would descend that made Gastone's eyes appear to discolour and move to the side, and his jaw would appear to drop into a leering smile. The back cover also featured art deco-inspired design elements, and detailed song information and album credits alongside tinted individual photographic portraits of the band members. The original gatefold sleeve's inner design depicted a large stylised photomontage of the band in typical 'laddish' pose, admiring the charms of a Can-can dancer (referencing the lyric of the title track).
When development was complete, the calotype was rinsed, blotted, then either stabilized by washing it in a solution of potassium bromide, which converted the remaining silver iodide into silver bromide in a condition such that it would only slightly discolour when exposed to light, or "fixed" in a hot solution of sodium thiosulphate, then known as hyposulphite of soda and commonly called "hypo", which dissolved the silver iodide and allowed it to be entirely washed out, leaving only the silver particles of the developed image and making the calotype completely insensitive to light. The calotype process produced a translucent original negative image from which multiple positives could be made by simple contact printing. This gave it an important advantage over the daguerreotype process, which produced an opaque original positive that could be duplicated only by copying it with a camera. Although calotype paper could be used to make positive prints from calotype negatives, Talbot's earlier silver chloride paper, commonly called salted paper, was normally used for that purpose.
James Frank Breazeale in 1918 opined that aluminium "is without doubt the best material for kitchen utensils", noting that it is "as far superior to enamelled ware as enamelled ware is to the old- time iron or tin". He qualified his recommendation for replacing worn-out tin or enamelled utensils with aluminium ones by noting that "old-fashioned black iron frying pans and muffin rings, polished on the inside or worn smooth by long usage, are, however, superior to aluminium ones". Aluminium's advantages over other materials for kitchen utensils is its good thermal conductivity (which is approximately an order of magnitude greater than that of steel), the fact that it is largely non-reactive with foodstuffs at low and high temperatures, its low toxicity, and the fact that its corrosion products are white and so (unlike the dark corrosion products of, say, iron) do not discolour food that they happen to be mixed into during cooking. However, its disadvantages are that it is easily discoloured, can be dissolved by acidic foods (to a comparatively small extent), and reacts to alkaline soaps if they are used for cleaning a utensil.
Slab of turquoise in matrix showing a large variety of different colouration Hardness and richness of colour are two of the major factors in determining the value of turquoise; while colour is a matter of individual taste, generally speaking, the most desirable is a strong sky to robin egg blue (in reference to the eggs of the American robin). Whatever the colour, for many applications, turquoise should not be soft or chalky; even if treated, such lesser material (to which most turquoise belongs) is liable to fade or discolour over time and will not hold up to normal use in jewellery. The mother rock or matrix in which turquoise is found can often be seen as splotches or a network of brown or black veins running through the stone in a netted pattern; this veining may add value to the stone if the result is complementary, but such a result is uncommon. Such material is sometimes described as "spiderweb matrix"; it is most valued in the Southwest United States and Far East, but is not highly appreciated in the Near East where unblemished and vein-free material is ideal (regardless of how complementary the veining may be).

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