Originally Posted by Gdot
U R Welcome.
I forgot to mention that there is some concern that it will turn rancid and rot out the stitching. Perhaps this is possible in work boots or other footwear that gets and stays moist. Never any problem for me with dress shoes that are worn once a week or less.
And of course any kind of moisturizer can darken a very light leather.
Sorry I haven't posted in a while, but I had a few minutes, and I find this topic very interesting.
Most oils/fats used to condition leather seem to be animal fats, like lanolin, mink oil, etc... which are saturated fats, as opposed to vegtable/plant oils like peanut, walnut, olive, corn, etc... which vary in saturation. There is a variation in the types of acid that each oil contains, such as lauric acid, palmitic acid, stearic acic, etc... that help define the saturation.
I wish I understood more as to the impact and longevity of various oils on leather, but I know a saturated fat/oil will not turn rancid nearly a quickly as an unsaturated fat/oil.
I do know enough not to use walnut oil on my walnut brown bluchers.