I was watching the soap challenge club entries for June and saw this amazing soap by ChezHelene The blue color especially struck me, since it's really hard to get such a color with only natural colorants. In the video she says she added an alkanet infusion to the oils, then she blends in blueberry puree and mixes in her masterbatched donkeymilk lye solution. She also gels the soap. This has me stumped. I've never tried that exact combination of additives, but I can't really imagine how that combination can get such an amazing shade of blue! Alkanet normally makes a purple soap. It sometimes turns blue (I've had that happen once) to turn purple after about a week. If the picture was taken in the first week, that could be the reason for the blue. Though alkanet is very finicky and any hint of tan in the soap can make it turn grey or brown. I'm surprised the donkey milk didn't affect the color. When I tried blackberries in soap, they turned a mauve brown and when I look for examples of soaps colored with blueberries, they're all brown.. if the donkey milk didn't dull the alkanet, the blueberries probably should have. Maybe they only turn brown after a while, something with pH or air exposure? Does anybody here have experience with donkey milk and how does it affect color? How about blueberries?