Almost all my soaps are milk soaps which I make using the split method. In this recipe I had 760g liquid, and had 360g distilled water, 280g milk and 20g water for mixing kaolin clay. It curdled before I added the essential oils. I usually hand stir all my soaps, but I tried stick blending it and it just made it worse. Super fast trace and all lumpy. Now I have had several batches where this is happening. I have tried temps of 95, 100, 110, adding milk to the oils before the lye, heating the milk to the same temp as the oils and lye, leaving it at room temperature....and still can't find a pattern. I began to think my oils were rancid, so I tried a batch with no milk and it turned out beautifully. What the heck?? Is there a difference between different kinds of milk - UHT or fresh for example? Anything else I could possibly be doing wrong? I have included a photo of one attempt which didn't exactly volcano but still turned out ugly and lumpy. It has paprika for color (but some of the failed attempts have had no color added at all).