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by stan_rogers
3868 days ago
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Not necessarily. Orthochromatic ("correct colour"), or ortho, materials were actually improved-spectrum materials that were sensitive well into the yellow-green. Prior to that, film and paper were really only significantly sensitive to blue/ultraviolet or "actinic" light. Getting to panchromatic ("all colours") was indeed significant, but ortho was advanced technology at the time. (And yes, being able to see what you were doing in the process room was a Good Thing™. Also, rubylith for masking.) |
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