discolour

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Due to its porous nature, grout is prone to discolouring and staining, especially in kitchens and bathrooms.
Veneers are thin pieces of porcelain, which are bonded to the front of the teeth, disguising shape and discolouring.
BEND outer leaves over cauliflower curds to stop them discolouring.
It turned out that the copper compound coating of the non-stick pan was transferring itself on to food and discolouring it.
Locals are seething over the discolouring of the legendary carving, cut into the hillside above Bratton and the oldest of seven white horses in Wiltshire.