Use to use until rendered useless (twice sent wrong type and incorrectly labelled): Light Impressions (was good back in Rochester days though). So, what is your source (inexpensive preferred) for Museum Archival quality 4-ply mat board (bright or warm white)? I need 18x22 and 24x30 size. I can cut the windows myself and would also trim 18x24 or 20x24 if cheaper to buy. Thank you for your help! Oh in Canada or at least not too far from Toronto would be nice!
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