豌豆与香料酸接触后会褪色。
Peas will discolour in contact with the acids in vinaigrette.
现代写字用的墨水通常包括了硫酸亚铁和少量的酸；写在纸上，颜色会越来越深，且能保持永不褪色。
Modern writing inks usually contain ferrous sulfate with a small amount of an acid; on paper they darken and bond becoming permanent.
在烫汁中加入一定量柠檬酸，可改善罐头风味和杀菌条件，并保持产品不褪色。
A certain level of citric acid is added to the soup to improving the can flavour and the sterilizing condition and retain no fading.
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