Kind of funny, but I was reading my Saponifier Magazine tonight and on page 17 it talks about using Micas in M&P.

Here is  a quote:

“Choosing colorants for melt and pour soap can be tricky. The most effective colorants are water

soluble dyes, which stir in easily and give vibrant color to the soap. However, these colorants have a

tendency to bleed or run, which can present a problem when doing layered or multi-colored

soaps. An alternative to these colorants can be found in micas and other pigment products, but

they will give duller colors and can clump or fall to the bottom of your soap if not mixed properly diluted

before being added. The ways of diluting micas or pigments are as varied as the methods of

soap making; some prefer to mix them with their fragrance or essential oils, others add them to liquid

additives such as witch hazel or skin nourishing oils like almond, while some simply

mix them with a bit of distilled water.”

If you don’t get this magazine it is well worth it. It only comes as a PDF quarterly.