We’re also bioluminescent but it’s on a spectrum we can’t perceive. In fact a lot of things have a glow we can’t see. It’s a mystery why we glow when the fact that we glow holds no use to us.

@@Broomer52 warnign to thigns that CAN see it, perhaps? We are pack rpedators, and endurance hunters. One of onyl a few on the planet. Even an overweight human can possibly walk a prey animal to death

Interesting, I wasn't aware of the existence of these lines. Gonna have to get a UV light and look at mine.

Thanks, mate. I've learned something new about us human.

@@ceilyurie856 You just gave me the mental image of a very fat man walking a turkey to death

makes espionage soo much easier if only we and another species can see it.

@@avroarchitect1793 were not stupid enough to ignore that robots/devices exist that can grey shift the colour pallet, so espionage would likely be a no go. Graffiti would be a definite yes, or just obnoxiously colourful clothing, everyone getting a technicolor dream coat.

You can already do this, usually it is done with UV fluorescent paint, but there is nothing stopping you from writing with UV reflective or UV absorbent paint that is transparent in the human visible spectrum

Epic art 🤷‍♂️

Someone will use it to make a swastika or some dumb shit

That would be a good business idea in that HFY universe

Sounds like the tree people beat us to it though. Don't want to copy those assholes.

Our colorblind glasses work only on a very specific kind of color blindness, where you can see all the colors but your cone cells of one color are too sensitive to light of another color too and you get mixed signals. They filter out specific wavelengths, meaning you see fewer colors overall but the ones you do see you can better distinguish. They wouldn't work for someone who is completely unable to see any color. You could, however, do something like what we do with Thermal cameras: false color. Basically take a camera, make it black and white, but then take anything of one particular color and make it extra bright and another color extra dark.

I think nanite implants that could rebuild the internal structure of their eyes would work better

Color correction glasses wouldn't work because they don't have the cone receptors that humans do, only the rods, therefore, only shades of grey. However, there has been some success with direct input of cameras into the visual cortex of people that were totally blind, allowing them to see, in color, no less. To the patient, the images were highly pixelated, but with practice, they were able to see enough to avoid obstacles and even read large print pages. The cameras were mounted in normal looking eyeglasses, which some folks have used to clandestinely film others. In other words, off the shelf tech.

Not necessarily. Graffiti can be done with markers or other things that don't leave prominent surface distortions.

spraypaint doesn't if you do it right.

I mean, technically micro and radio waves are below infrared, but yeah. Whole swathes of color we can't even begin to see because of the various physical limitations trying to evolve something like that would present.

That won't work if the pattern happens to have the same luminance as it's surroundings.

And a species poor eyesight might extend past just the difference in colours

If you take a red light and eliminate all other light sources and then take a watercolor palette or something similar you'll be surprised at how many colors just disappear.

When they make paints, they wouldn't control for colors. What looks like the same color to them may look completely different to us. It's just like we don't know how different colors look in the ultraviolet.

There are a lot of inks, paints, and similar substances that only show up when floresced or otherwise color shifted.

Actually no, if the color was the same "brightness" you really would have a hard time seeing it. I remember reading of a hypothesis about humans developing a good color vision to help us avoid snakes as it's really easy to confuse them with vines or just sticks in the ground.

From the description of mono-chromism, they would seem to have a rods-only vision. Chroma-glasses shift color frequencies to wavelengths better perceived by the limited or defective cones available