system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do squids turn white after they have been killed?

I just saw a video on youtube where the squid instantly loses its color after it has been killed.
gpt
So squids, octopuses and cuttlefish all have the ability to change their skin color by squeezing tiny pigment sacs in their skin to varying degrees.

However, when you kill the organism, all neurological signals to those little pigment sacs is halted, and they resort to their natural color.

It's pretty much the same reason all muscles in your body stop working when you die, except instead of movement the result is coloration.