Oil and food dye?

Why doesn't food dye dissolve in water?

Answer:
Some food dyes DO dissolve in water. The US FDC approved food colorings do dissolve in water.

Dyes used in some other things sometimes do not. For example, those used in plastics are not generally water soluble.
As oil and food dye are generally organic compounds which does not develop polarity ,hence these dyes does not dissolve in water,.

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