I'm trying to make breastmilk jewelry with breastmilk and resin. I cannot figure out a way to preserve breastmilk. Either the resin doesn't set properly or the milk changes colors in a few weeks. Any formulas or ideas to try? Thank you!

Check out this site:

https://boobshalffull.wordpress.com/2011/12/15/milk-and-casting-resin-tutorial/

This one might be even more helpful:

http://www.dailymail.co.uk/femail/article-2305784/How-jewelry-breast-milk-unlikely-trend-new-mothers-adorable-gross.html