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I'm not up on resins so have no idea what amines are but I do work for a pigments manufacturers so may be able to help from that side.
I would think you could use some of the metal oxides as these are quite stable as a finished pigment and have good light and heat resistance.
problem is some are controlled regarding what you are allowed to use them in so you would have to have a read up.
Iron oxide may work but colours are limited, you can get a black.
other problems will be mixing/wetting the pigment as epoxy manufacturers will use sheer mixers to thoroughly mix the pigment, you could try a long period of wetting between mixing.
Because I'm not clear on the Amine id say a test sample will be a definite.
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