| 1. | The blue dye is edible and does not discolour upon heating.
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| 2. | Prolonged exposure to direct sunlight may also discolour or dehydrate turquoise.
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| 3. | Sterling silver and pewter will oxidize and discolour from the heat.
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| 4. | Some dyes such as indigo carmine may discolour the feces temporarily.
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| 5. | The rear lights themselves often discolour and are notoriously brittle.
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| 6. | Old mines become white, but otherwise do not discolour the leaf.
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| 7. | The pulp tends to discolour if left overnight, even in the refrigerator.
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| 8. | The ailment also caused his skin to discolour somewhat, becoming streaked with brown.
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| 9. | The milk is first maroon through mixing with the different colours and discolours green.
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| 10. | There are other drugs that can discolour urine.
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