I also use the silk in some of my soap recipes. I love it! I'm also not sure if it'd work with the frozen milk. What I'd probably do is to hold back a half cup of milk and replace it with water and bring it to a higher temperature, stir in the silk, then let it cool before adding to the milk/lye mixture. I find that sometimes the silk doesn't completely dissolve in the water but the heat generated from the lye usually does the trick. Thus, if you're keeping the temperature down with the frozen milk, there's a chance that it won't completely dissolve.
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