I followed the steps i found on this site... both times I used half an ounce of herb and roughly 225ml of glycerin. First time I did it in a slow cooker for 8 hours but it basically burnt it and it didn't work. The second time, i put a pyrex in a cooking pot then put a sealed glass container in the pyrex and kept the water between 160-175 for 8 hours mixing every hour. I got the nice very light brown colour that I should be looking for but didn't create any high when used in my e-pen. Any suggestions? I don't want to keep burning through money.