mixing preserved breast milk powder into resin

Hi there,I want to make a breast milk pendant which has a creamy white color. I preserved the breast milk and turned it in a very fine powder. But no matter what I try, some white pigments are always sinking down, so that you see white dots/flakes in the finished resin project. I am using epoxy from artresin.
I tried:
-using less powder
-waiting a little before mixing into resin
-pre-mixing a small amount of powder with resin on wax paper and then adding it to the resin for my project
Any advice? Thanks