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Your water is a bit high though. Do you cover/insulate your mould after pouring? And did you perhaps add fragrance with linalool or limonene in it, or lavender essential oil? I don't normally get soda ash, however, lavender EO definitely causes a bit of soda ash after some time. I wrote a blog...

Thanks. It's "black henna" (indigo tinctoria), or just plain indigo :) For this experiment I used half a teaspoon in about 4oz (117g) of water, added 72g NaOh and 6g KoH to see if the lye extracted more dye. So, I will stick to mixing it with water and adding at light trace, works better for me...

I've been playing with a recipe to add indigo henna to lye water to (hopefully) make a baby blue soap. Last night I decided to try it with dual lye, 95% NaOH and 5% KoH since I want to use it in a CP castile recipe. I added the henna powder to distilled water and then added the lye and left it...