Shedding New Light on Darkroom Illumination
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Like the absorption filter safelight, the dichroic safelight could be dimmed or turned off and on instantaneously to suit the task. Dichroic filters, although fragile, are not as subject to fading or color shift as dye filters. The dichroic safelights were used at Deluxe Laboratories, but to my knowledge, are not in widespread use today.
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