Copper utensils ruin pickles as they give off metallic taste, the acidic reaction corrodes the utensils, discolours the ...

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On the Presena Glacier, ‘blood snow’ blooms: pink algae thrive in the meltwater warmed by rising temperatures, creating surreal colours. The pink algae discolours the ice, darkening it and thus ...

Someone chimed in with their experience: "I think when I take the cucumber from the plastic, it discolours faster. It lasts okay still, though; it just doesn't look as green and appetising." ...

The traditional touchstone test involves rubbing the gold on a stone to see if it discolours or turns black. Fake gold, when rubbed on a touchstone, will show a dark mark, indicating it is not pure.