| Aged vinegar acquires an increasingly brown colour as enzymes discolour compounds from the original fruit. |
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| Avocados discolour very quickly, but a splash of acid rubbed or brushed on will slow that process. |
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| Acidic liquids can discolour the surface or even eat into the top layer of concrete, leaving a slight roughness. |
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| If the ink is placed too near the surface, it will prematurely fade or discolour. |
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| Having digital copies is all very well but they don't fade and discolour as the years go by. |
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| The UV proportion of the light can discolour wood or plastics, for example when installing in closets. |
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| Using sealants which can discolour as a result of absorbing soil or dirt particles from atmospheric pollutants. |
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| Once the fuzzy grey fungal growth appears on the foliage, causing it to discolour and rapidly deteriorate, the disease may then spread into the main body of the plant. |
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| Once activated, the nickel shield will quickly discolour from exposure to heat. |
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| The covers are made of top-grade grey rubber that does not discolour the plasterboard. |
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| The face paper has a slight tendency to discolour, but this does not affect the scannability of the bar code. |
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| Bird droppings contain chemicals that affect and discolour paintwork very quickly. |
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| Because of its porosity, it tends to absorb grease and oil, which discolour it. |
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| Light is also a problem in that the visible spectrum, especially the ultraviolet aspect, will bleach, fade, or discolour the wood. |
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| Until Bregma developed their product, coated dental wires were prone to chipping and any coatings that were matched to tooth colours had a tendency to discolour. |
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| Pages swell up, discolour and stick together, and covers distort. |
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| For endurance in exterior use, marble should be uniform and nonporous to prevent the entrance of water that might discolour the stone or cause disintegration by freezing. |
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| Prolonged or repeated exposure to hydrogen chloride vapour may discolour and erode the teeth, ulcerate the nasal mucosa, and cause nose and gums to bleed. |
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| They are chosen for chemical stability with regard to light and atmosphere so that they can eventually be removed by safe solvents and will not rapidly discolour or physically deteriorate. |
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| The ideal disinfectant would rapidly destroy bacteria, fungi, viruses, and protozoans, would not corrode surgical instruments, and would not destroy or discolour materials on which it is used. |
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| Tape' grade fabrics will keep their black colour after such a test, while PFF dyed black in surface would discolour and the bath would retain the colour. |
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| For example, thatch may contaminate or discolour water. |
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| It is important to note that because of the high temperatures reached on the surface of a fireplace, almost any type of high temperature paint will tend to discolour over time. |
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| Contrary to popular belief, these products can discolour and damage the finish and leave a residue on the surface that can render the floor slippery and difficult to maintain. |
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| Vapour barriers are required to prevent the condensation of water in walls and ceilings, since moisture reduces thermal values and can damage and discolour building materials. |
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| Because of the paper's high acid content, pulp magazines tend to discolour and become very brittle over time, and as a result very few have survived the decades in good condition. |
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| Bronze is used to make bronze wool for woodworking applications where steel wool would discolour oak. |
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| Both titanium dioxide and zinc oxide are harder than gold or silver, so as the gold is drawn across the face small amounts will abrade and discolour the skin. |
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