@user66001 Regarding
meta.cooking.stackexchange.com/questions/1767/… When does something need a citation, and what does it mean? Something needs a citation when it is not obviously true
or obvious and simple to verify without a specific citation, or when you are quoting or using the work of another. In this case, the fact in question is very, very easily verifiable. I had provided you the key phrase of jargon "standard of identity for margarine".