Dye Transfer takes place to leather when it doesn't have any protection, stains can happen without leather protection being applied.
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A specialized natural cleaning product that eliminates color transfer on light leathers, such as blue jean dye transfer, newspaper print transfer,
Leather Master Leather Dye Transfer Cleaner
If you are working on white or light colored leathers, this product is for you! Luxury Leather Repair's Anti - Dye Transfer Top Coat is a Water-Based, Easy-to-Use clear protective coating, that makes cleaning light colored leathers a breeze!! The microencapsulated dye blockers formulated into this product do not allow for dye transfer to absorb into the leather or vinyl surface. Simply apply this product to the surface of your leather or vinyl and let dry.
Anti-Dye Transfer Leather & Vinyl Top Coat 8oz / Low Gloss
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Dye Transfer - Leather Repair Company - Leather Encyclopaedia