The predominant color of the flora and plant organisms of a planet in relation to the type of star it orbits and the wavelength it generates.

2 hours ago, exchemist said:

I wonder if that could be an effect caused by a mix of reddish and greenish light, appearing to the eye as a yellow tint. I don't think anything in blood will actually fluoresce, not least because the UV will be attenuated under water more than visible light.

But the way light is attenuated by seawater seems to be quite complicated. The red end of the visible spectrum seems to be absorbed more than the green and blue, but UV is also absorbed. And then there is the competing phenomenon of scattering which will scatter the blue more than the red.   

The attenuation of light by water depends on whether it is fresh or marine as well, spending many years growing live coral required an understanding of how light and water "slide past" each other, even the glitter effect can have a strong influence on coral growth. The glitter effect allows for a more intense amount of light reaching further into the water. UVa penetrates far enough for coral to need chemicals to turn that UV into visible light, it allows the UV light to be used for photosynthesis and give many corals their bright colors... in fact I used black lights to influence coral to produce more intense colors. Light plus water equals some interesting phenomena. 

Edited April 6, 20241 yr by Moontanman