Homelss Joe-
Have you tried to get Coke to tell you their formula lately?

A lot of businesses have "trade sectrets" that are not divulged to outside parties. yes, many of these "trade secrets" are known or at least assumed with 99% certainty of what they are, but the company will not tell outsiders. Divulging these secrets is often serious enough to be cause for termination. Some gun people have the same philosophy. Almost every business has some bit of information that all employees are forbidden to tell folks outside of the company. "Lower rung" employees may not be aware of them, but the secrets are usually there and known by the upper people on the org chart.
Mineral oil and paraffin oil are byproducts of refining crude oil. It has been too many years since I had organic chemistry to remember the differences, but I do know that both paraffin oil and mineral oil work well for rubbing stocks. Mineral oil is "baby oil." I use parafin oil I bought at Woodcraft for any rubbing that I need in stock finishing.
But the rubbing oil in the Purdey's Worthaog kit smells great! I wish I could get large bottles of thta for a reasonable price.