The red stains that are left on the feet after one has worn leather sandals or shoes is due to the dye reacting to moisture in or on the feet. If the sandals are very expensive, you might try returning them for a new pair, as this is not something that should happen with expensive or quality goods. If you regularly wear the sandals in areas where they get damp, try to avoid this as often as possible. If the problem is moisture that is coming directly from your feet, you might want to make a visit to your doctor and ask to try one of the powders, creams, and now even pills meant to deal specifically with this situation. Another solution is to wear socks, although, if you do not live in the Pacific Northwest, this may be met with a bit of humor and disdain.
For lesser expensive shoes or sandals, there has been some success in preventing the dye from running altogether by carefully soaking the leather in a mixture of either salt and water or vinegar and water, although measurements are pretty much an "as you guess" situation.
Leather ought never be subjected to any of the following substances:
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