Contact printer, you use the red light to fit the negative against the glass and then the paper with the emulsion facing the light. After that, you close it and turn on the white light that will expose the paper.
this post was submitted on 24 Oct 2023
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Looks like it might be something you'd use in a darkroom when printing B&W. B&W paper isn't sensitive to red light so you can use that to see what you're doing.. Tho it's would only be for printing.. Not for developing the film tho.. That is still sensitive to all wavelengths :)