If you happen to spill something on your shoes removing some of the hand-painted finish it is easy to solve the issue. This is not a defect, as highest quality pairs strip the easiest. If your pair does not strip when exposed to some sort of chemical it is likely an overly processed leather.  A quick trip to the cobbler should be all you need to get your shoes back into good shape. 

Feel free to check out this post from @mbshoedoc for some more information: https://www.instagram.com/p/BnbFm5ynhqi/?taken-by=mbshoedoc.