Last weekend I took a pair of boots and a belt that were not only VERY old, but in a shade of brown that had never been quite “right” for the rest of my wardrobe. These pics (swipe for more) show after/before/what I used to take them to a much richer (and more usable) color. Easy peasy, and I spent under $7 on materials (I already had the leather preparer and shoe polish on hand).
