a sponge damped with diluted vinegar will help "set" the dye.
But are you sure it is the dye and not the oil?
Dye normally is absorbed by the leather and dries within a few hours.
Some makers use a lot of oil to resoften the leather.
Might try the diluted vinegar with warm water.
This will help remove excess oil.
also buff it with some elbow grease. Rub it in.
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