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Is it from reflections, or silhouettes? Because I've seen some dark nebula have brown tones, and I think that's impossible if light is not reflecting off of it; I've also seen very black ones that require the most background stars as possible in order to see as a silhouette, and they sometimes have dark blue tones. What is a dark nebula?  All this time learning about astrophotography and I don't even know what a dark nebula is.
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| Dark nebulae are defined by absorption of light, by and large by dust in its various forms. |
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| Yes - reflections and silhouettes. Most are visible as they reflect/absorb light from a nearby star. Most of the vdB catalog also have LDN/LBN targets nearby, made more visible by the same cluster of stars. Also, because the Milky Way is a bright galaxy, our sky is not black and these objects can be seen as silhouettes as they block the stars/light behind them. Significant integration time can be required. |
