I think you want to know what Paint to use:-)
The only options with white is acrylic (or oil based paint) Both of these do not penetrate the leather, just putting themselvs on the surface, that means that in due time they both will wear of.
I have made some experiments with artist oil paint, diluted it with oil and terpentine, it works fine on veg.tan leather, it does penetrate more than other kinds of paint (but way less than dye) and hold up better than most other paints I have used. The downside is that it has to dry properly before adding the sealer, it can take weeks (and more).
I hope this help you a bit along the way :-) //Tina