This Platine print was hot mounted on rag board with acid free tissue, but the edges are discoloring. I have one other print doing the same thing. Only these 2 prints were hot mounted, I usually use corners. Tried to send a message to Canson with no response and cannot find a contact phone number for them. Also checked with the maker of the tissue and they are stumped as well. Does anyone know the upper temp limit for hot mounting these papers? I typically use 185F. Thank you.
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