Aniline Dyed - Desede Sofa

[Questions!]

Hi Roger I contacted you back in Feb about two German DeSede sofas that I have. They are very good quality aliline dyed leather. They were manufactured by Neinkemper in Toronto. Over the years they have faded and discoloured. I wonder if you could suggest treatment and products for them?
I have read your suggestions on your website and marvelled at your depth of knowledge on the topic... So I feel I and my sofas are in the best possible hands! Thank you very much Lee


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