Real life ain't abstract math. You have MSDS 'mulmen mentioned, but I also can't imagine any factory being able to just mix shipments of ingredients "A", "B", "C", etc. without the actual content being documented on purchase orders, OSHA reviews, etc. You may want to operate in secret, but at the very least, the taxman really wants to know if you aren't skimping on your dues, so there should be plenty of relevant documents in circulation.