What does it mean by "dye" in medication?

Hi,I did the following:

What does it mean by "dye" in medication?Anyone knows what that means? I saw some pills says" allergy dye-free", what does that mean?

-Dr. ﻉ√٥ﺎ
Well dye meaning that they do that to make the pill a certain color, and sometimes people are allergic to the dye.

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