This video is a quick demonstration on how to repair dye transfer on a leather seat.
1) Clean the affected area thoroughly, starting first with Simple Green all-purpose cleaner, and then secondly with denatured alcohol diluted further with water. You can use a Scotch-Brite pad to clean out the grain areas of the leather too.
2) Make sure the area is completely dry. A hair-dryer can be used to speed this step up.
3) Prepare the Preval Spray Gun by transferring the dye to the bottle -- you can use a piece of cardboard or a paper towel to prime the sprayer and get an idea of the spray pattern as well.
4) Spray very light coats of dye, allowing time (about 20-30 minutes) between coats so that they fully dry.
5) The area should be fully dry an hour after the last coat, but the dye still needs 48-72 hours to fully cure. Treat the redyed area with extra care, making sure not to get any water or chemicals on it in the meantime.
Seat Doctors Leather Dye: https://www.seatdoctors.com/shop/automotive-leather-dye
Non-Abrasive Scotch-Brite Pad: https://www.amazon.com/Scotch-Brite-Scratch-Scour-Pads/dp/B0043OYFFU
Scott's Shop Towels: https://www.amazon.com/Scott-H-PC-53693-Shop-Towels/dp/B006O9SQ4I
Preval Spray Gun: https://www.amazon.com/Preval-267-Spray-Gun/dp/B0000AY19M