The industrial 100% Silicone is an interesting comment. The "typical" person is NOT going to find this stuff and will be using the type with other ingrediants that will be hard on leather after long term use. Thus the recommendation from gun leather makers.........I still recommend it.
I do know that Silicone, due to its very small Molecular Weight, or another way of saying it has very small molecular makeup, can get in leather and force out" its natural oils. This is why its such a good lubricant it gets in places that some other lubricants cant.
It also tends to stay in place better than other lubricants as its makeup is made of "chains" on the molecular level, as to oils individual "platlet" makeup. The chains stay togethor much like cheerios do in milk and resist moving.
Also, the Govt. says when you label something 100% "Product", while putting in propellants, stabilizers, detergents, anti foaming and anti fungle agents to a very minor extent also. Usually just enough to make sure it stays stable through its "natural shelf life" in the form its sold. Typically the shelf life of Silicone is 7-10 years.
FDA Approved Silicone Spray, designed to be used in/on food processing equipment for lubrication, meets this criteria. Its pure enough to not harm you when ingested, according to the FDA and such agencies anyway. The theory is, when it drips into the cake mix being processed in the mixer, they used the spray on the night before during its PM, it wont kill/harm you. Thus its FDA approval.
To my knowledge, the only oils put in leather in the tanning process are what they think they are removing due to the tanning process itself.....at times a well rounded guess or an average.
Just trivial stuff at best but interesting.............Shoot well.