This one soaped perfectly! No acceleration and discoloration, and first time my swirl was successful! I just wish I had used more than 1.5 tsp charcoal for approximately 600 grams of soap mixture to achieve a true black. Nonetheless I am happy with the way this turned out, including the black tea fragrance. It reminds me of lemon iced tea, in a good way.
Base oils (900 grams): olive oil, coconut oil, lard, rice bran oil and castor oil; additives: charcoal and bentonite. Mixing temperatures: lye 102˚F, oils 90˚F.