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You could pump any liquid through them!
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Come on, Einstein
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Good lord, you're right.
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These aren't infrared at all.
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They're safelights! Common standard-issue safelights!
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We're in a darkroom! This room is a great big darkroom!
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and this must be photographic paper.
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Meaning we can develop it?
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You hope... developing photos isn't a one-stage process.
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It takes chemical baths, fixing agents...
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For colour photography.
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To pull black letters from a white background