alt Hacker NewsReal 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.
I do recall some episode of "How its made" or similar of a food factory discussing some mix they were doing for a fast food chain, IIRC, that involved "two separate bags of spices, each sourced from a separate supplier for secrecy". That's about the level I'd expect out of such a scheme.