Not exactly. Usually, worn leather displays coloration from light grey to parchement color.
Unless you are going for an ultrarrealistic depiction of leather armor, I\'d skip this kind of aging (and by ultrarrealistic I mean the attention to detail that military modelers strive for, putting in bullet holes, rust marks and metal showing through the paintjob of a tank).
The black basecoat is a must, but instead of adding white for the highlights, I\'d suggest you add another middle brightness color, like ultramarine blue, or gore red. I like my layers to start from black, and go all the way through to the pure middle color right at the edges.
The trick is to get a consisten gradient, and try to keep the last highlight as small as possible.
The difference I make between leather and plate armor, is that for plate armor, I add another highlight, this time mixing a bit of white with the middle color, for that extra sharp, hard edged look.
