I tried it using mica and it completely lost its transparency. Liquid colorants in soap seem to be gaining popularity. Is glycerine the main ingredient?I was wondering about this too. It looks like the recommended usage rate for mica in M&P is .5 tsp per pound of base, but I'm not sure how transparent it is. Did you try it? FWIW, I used liquid colorants that I bought at a craft store to use when I made soap with my grandson. I let him add the color himself and the green was almost black (he was under 3 at the time). Needless to say, I helped add color to the others, which was what went home with him.
Going to hold off on a second go for a few weeks. Need to really think about this one. I was able to salvage the M&P I used for my first go. Think I’ll melt it down and use that to lightly color my next attempt.