After the food has been left for a while, various changes will occur:
Water in the food may evaporate. This concentrates material that were dissolved in the water and deepens the color.
The pigments in the food may also break down during this period. This may lighten the color of the food instead.
Microbes may proliferate on the food. The microbes may digest the food and produce colored chemicals responsible for the color change of the food.
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