I stole the title of this post from a Reddit posting. I couldn't describe the smell well so I had not brought it up before. Anyway, a while ago I had a few batches develop an off smell. The best I could describe the odor was a nutty ammonia smell. One of the FOs was Coffee Bean from WSP. It was overwhelming and horrible. After two batches I tossed the rest of the bottle. The other FO I had this happen with was their Almond Fragrance Oil. This time the offending odor was more in the background but the soap was more of a cherry smell than almond. The ingredients in the first batch, so far the only printout I can find, were coconut, olive, lard, avocado, castor oils and shea butter. I have simplified my recipe to reduce ingredients since this batch. Is there any ideas on what might have caused this off scent to develop?