A black rainbow is a real thing; it appears where water drops reflect light away from the viewer. : r/Damnthatsinteresting

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Rainbow on (behind) the horizon. Origin is behind the curve : r

Make Your Own Rainbow

In a rainbow formation why reflection takes place inside the water

Rainbows and refraction

Can there be a reflection of a rainbow? - Quora

If Rainbows are caused by light refracting through water droplets

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If Rainbows are caused by light refracting through water droplets

Refraction and Reflection in a drop - what creates a rainbow

Exploration into the Physics of Rainbows

If Rainbows are caused by light refracting through water droplets

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Color and Vision