I just ordered two sliders (black epi and vachetta) from Leatherprince. I asked them the question about patina on the vachetta. The response is "The vegetable tanned leather will turn darker as time goes by..." That's good enough for me, although I realize that the different leathers will probably patina at different speeds and will not be identical. I'm so glad to have found this option thanks to you ladies!
Oh wow..that's awesome!! I'm really loving the way the epi sliders are looking as well. Love Etsy for their variable custom orders!!!