Anyone definitively know what sunlight does to leather? Does it make it darker or bleach it out? I would guess it lightens it by kind of bleaching it out, like you see on very old car seats sometimes. However, a girl I know got some sort of LV purse which has that natural tan leather on it and she wanted to darken it, she did so successfully by leaving it in a windowsill. I have a couple of pairs of tan shoes where one is darker than the other. Last night I tried polishing my entire lighter shoe with tan polish. It may have darkened it ever so slightly, or possibly not at all. So, this might work over time, but it would require I keep polishing one shoe while not polishing the other at all. Seems like once the color matches, one will be way more shiny than the other. Next, I tried mixing tan and regular brown polish on the dauber. I kinda swirled it together to hopefully get a dark tan. I test-applied it on the inside heel to see what kind of color this would result it. It is waaay too dark. The streaks of the wax were very obvious, in short it looked exactly like I accidentally tried to polish my tan shoes with brown wax.