| As plates and films became more sensitive, ruby safelight filters became necessary, but the old manipulation techniques could still be utilized. |
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| The films could be empirically adjusted to different OD values by exposing them for various lengths of time to a red darkroom safelight. |
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| Bathed in the red glow of the darkroom safelight, Ian McDonald was staring hard at a ruined photograph. |
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| Orthochromatic films are not sensitive to red light at all, and may be developed under a red safelight. |
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| The glossy whiteness, cast with the yellow or red of the darkroom's safelight, begins to stir with a vague smoky shadow. |
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| Orthochromatic photography refers to an emulsion that is sensitive to only blue and green light, and thus can be processed with a red safelight. |
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| The primary requisite for inspecting panchromatic film is a dark green safelight filter. |
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| This is because the brown stain of Pyrocat-HD blocks green light and makes it difficult to evaluate the negative by transmitted light when using a green safelight. |
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