I'm not sure about whether of not the backing is acid free. I've stayed away from darker backing, especially dark reds just in case there were any concerns about bleeding. I haven't noticed any problems at all. I guess acid issues would show up over a longer period of time. I'd worry about that more if the items I was framing were bigger $$. If I was framing a high $$ item, I'd do my best to make sure the materials as inert as possible.
Last edited by bocca001; 04-24-2023 at 07:37 PM.
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