So I've been extracting for a minute but have been going over issues I may have been having. However, one thing I don't understand is that when I use a higher temp of heptane for the re-x, my crystals are white and seem to be better purity. While I've been trying recently in the recommended range of 40-42 C, I get a yellow mix that is crystalline and more glass like consistency without any layer of slag and no larger crystals form. Please tell me, how should I be performing this? For context I'm using Nomans STB. Thanks guys