Not sure what this is?

[Duolab123]

The earlier color correction filters by Kodak sold under Wratten trademark was dyed gelatin sandwiched between glass. It looks like the camera was using daylight balanced color film with tungsten floodlamps, at least that's my guess. If the blue gel is gelatin you can dissolve a corner bit in 200°F water, like Jello gelatin dessert.

[phdgent]

The earlier color correction filters by Kodak sold under Wratten trademark was dyed gelatin sandwiched between glass. It looks like the camera was using daylight balanced color film with tungsten floodlamps, at least that's my guess. If the blue gel is gelatin you can dissolve a corner bit in 200°F water, like Jello gelatin dessert.

Yes, dissolve the gelatine like Duolab123 said, and then clean the glass sheets thoroughly and put a LEE foil filter (or an other brand) in between so it is protected, and it will stay flat (and would not flutter in the wind). Use that combo in a compendium to reduce stray light reflections on the glass surface.

BTW, a blue filter can be used for (B&W) reproducing old important documents, and manuscripts, mostly written in that ancient brownish walnut ink (which was common in the Middle-Ages), and which had been, in a later period, annotated with these infamous blue aniline pencils.

I did it, in the early '80s, as an intern for the Museum of Fine Arts library.

[Duolab123]

Yes, dissolve the gelatine like Duolab123 said, and then clean the glass sheets thoroughly and put a LEE foil filter (or an other brand) in between so it is protected, and it will stay flat (and would not flutter in the wind). Use that combo in a compendium to reduce stray light reflections on the glass surface.

BTW, a blue filter can be used for (B&W) reproducing old important documents, and manuscripts, mostly written in that ancient brownish walnut ink (which was common in the Middle-Ages), and which had been, in a later period, annotated with these infamous blue aniline pencils.

I did it, in the early '80s, as an intern for the Museum of Fine Arts library.

That's a great story. I remember reading in my old Kodak books about copying old photos and documents. I did quite a few photo copies for friends, took 4x5 copy negatives of old family photos and printed on 5x7 Ektalure G. Ektalure was amazing!