Dyed leather is returning to original color??!!

[Dyed leather is returning to original color??!!]

10 hours ago, AmericanSon said:

The book "Tanning Chemistry The Science of Leather" by Covington and Wise has a chapter on dyes.  They mention that too much surface reaction during tanning with chromium salts can cause splotchy coloring with dyes or act as a complete resist to dyes.  From what I could gather in a quick read the amount of surface reaction with chromium is determined by the tanning conditions (pH, chromium concentration, etc) so dye uptake is a problem with some, but not all chrome tanned leathers.  The authors say chrome tanned leathers are cationic (positively-charged) and therefore generally react well with acid dyes. Really good info here.  Thank you.  I am sure it is the salts but I just can't figure our why.  The dye job looks so great for about a week but once it hits the sun forgetaboutit.

 

Maybe you should change your finishing methods to help improve skin stability. That's an option)

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