I have used leather dye on a pair of blacl motorcycle gloves to turn them red for a costume. Mostly they sit in a box but when I do wear them (once every few years), the dye remains and doesn't come off.
It was probably a Fiebings product.

>>2994408
go to Tandy Leather and get a bottle of leather paint, big guy

I ruined my father's coat when I was a kid.
What I can say is don't use color paint and lighter (for when color doesn't stick)