In the 1980's, I have used kodak Hi-Res plates type 1A, but in small 2-1/2" square format (hence I cannot speak about them here
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Spectroscopic plates were in principle panchromatic in order to record the whole visible spectrum.
The legendary 649-F, used to make holograms, was panchromatic ; at the time, many holograms were made with red laser light, hence only panchromatic plates could be used with a red laser.
Kodak plat Type 1A, on the contrary, was sensitive to UV and blue only and designed for mask or reticle fabrication. There was no blue laser at the time ... only mercury arc lamps.
I remember having processed those Hi-Res plates in D-19, in a Combi Plan tank, under a red safelight. The Combi Plan rack can accommodate glass plates, simply by reversing the holding grooves, one side = curved grooves for sheet film, the other side = straight grooves for glass plates. Too bad, no Combi Plan rack in 8x10"
Hence an important point is to identify the type of spectroscopic plate, is-it panchromatic or only sensitive to UV & blue ? The best would be to find the technical data sheet in order to have at least an idea of the ISO rating as a starting point.
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