This is the second time this has happened. I am making CP soap from 100% lard, which I rendered from bacon fat. In the pot is nothing but 33% lye solution and liquid fat. Upon pulsing the stick blender, suddenly a blood red transformation spread out from the blender. Before I knew it the batch looked like the picture. It also seized, but maybe my temperature was too low (I had prebatched the lye so it was room temp and my fat was only just melted at start). I've made soap this way about 5-6 times and only gotten this reaction twice. Any idea what this could possible be due to? Thanks for any thoughts!