Is the citric acid (crystalline, food grade) offered on Amazon/E-bay the same formula as the citric acid offered by taxidermy suppliers? After searching the forum, and find a couple people have asked this question before. But they didn't receive a confident answer. I've already purchased citric along with degreaser and tan but being a businessman and cost conscious, I. have to wonder if I'm wasting $$. Does anyone know if the concentration is identical or if the suppliers include any additional additives? The cost difference is as much as half the price. P.S. One could argue that cost conscious would dictate sending skins to a tannery.... And I would agree. My interest in mastering tanning stems from a desire to understand all phases of taxidermy, (including the basics). I feel being a "Taxidermist" requires a working knowledge of all phases of our craft, otherwise I'm just a specialist. So I'll process a small quantity of capes/back skins for my own personal use and experience.