I haven't tried any flourescent dyes and so I can't help there.
I have tried food color in the past, with mixed results. It seems to take a high concentration of dye to water, and it was hard to obtain it in enough quantity economically. The food color seemed to be more subdued in color for the most part, except the yellow was actually quite impressive in the color depth. I don't know how color fast food coloring would be though, compared to commercial anodizing dye.
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