How to use became discoloured in a sentence? Find typical usage patterns (collocations)/phrases/context for "became discoloured" and check conjugation/comparative form for "became discoloured". Mastering all the usages of "became discoloured" from sentence examples published by news publications.
Notre Dame is built from limestone, which the BRE found became discoloured at the relatively low temperature of 250°C, thanks to chemical reactions in iron compounds within the stone.
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In addition, the polymers themselves became discoloured and brittle. By the mid-1990s, laser cleaning was established for stone and started to be used for other materials such as gilded bronzes and frescoes. A major breakthrough came when an Italian physicist at the National Research Council Institute of Applied Physics in Florence, Salvatore Siano, developed a method that used even shorter pulses, of only micro- to nanosecond duration. Another major innovation in the last decade is the use of colloid science and nanotechnology in conservation.
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Earthenware utensils suffer from brittleness when subjected to rapid large changes in temperature, as commonly occur in cooking, and the glazing of earthenware often contains lead, which is poisonous. Thompson noted that as a consequence of this the use of such glazed earthenware was prohibited by law in some countries from use in cooking, or even from use for storing acidic foods. Van Rensselaer proposed in 1919 that one test for lead content in earthenware was to let a beaten egg stand in the utensil for a few minutes and watch to see whether it became discoloured, which is a sign that lead might be present. In addition to their problems with thermal shock, enamelware utensils require careful handling, as careful as for glassware, because they are prone to chipping.
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