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I recently came into the possession of many of these glass "things." I believe they're glass positives used for offset printing, but I'd love to learn more. Heck, I'd like to know that I'm wrong, and educate myself.

I have them in many sizes: 18" x 18" up to 24" x 36". They are very heavy. I've only looked at a few. I would date them from 1940 - 1970, and maybe older.

Once I figure out what they are, I'll explore what to do with them.

Thanks.

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Those are certainly positives used for making printing negatives using a light sensitive coating/material.

Most likely for offset printing, but possibly also for silk screen printing. If they were for color offset printing I would expect there to multiples with variations for each color.

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    \$\begingroup\$ I have found examples where multiple colors were identified for the same image. They did not identify with CMYK though. They seem to be spot colors. \$\endgroup\$
    – allnightgrocery
    Commented Jul 31 at 0:56

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