The reason anything is the color it is is because that’s how it appears.
Am I missing something?
It’s like saying, “oh the sky is only blue because it scatters blue light”. Well then the sky is blue. Full stop.
“Red paint is only red because it happens to absorb certain other color spectrums leaving mostly red light”. Ok then it’s red.
> Am I missing something?
Now yes, the sky will be yellow or whatever color the plastic is but if you go around and start telling everyone that they'll call you crazy.
If you really want to get into it, colors are also determined by what everyone else sees. You could be colorblind and what color something is to you is not what color that thing is to everybody else. Or you could take the sun itself, which everyone agrees is yellow except some armchair expert redditor who once heard in science class that "the sun is green" and is willing to discount his eyes rather than hear the rest of the discussion where it is white because it emits in a broad spectrum and appears yellow on Earth because the blue sky removes some colors before we can see it. So you can imagine a future civilization where most people don't live on Earth might call the sun "white" but for now everyone will call it that because it is yellow. This is a bit in your favor but you might notice the main point of my previous comment isn't about blood looking blue so much as the pigs being fucking neon blue and that blue looks nothing like blood and could not be mistaken for the same thing. Look at the pictures.