I want to say there's a chameleon which is sometimes red and sometimes blue. I can express it as 'there's a chameleon sometimes red and sometimes blue,' but can I also express it as 'there's a red and blue chameleon'?
"The chromatophores in this chameleon's skin can alternate between red and blue hues."
This gives the reader more information about the mechanism chameleons use to change colors, as well as indicating that the red and blue colors are not produced simultaneously.
Fascinating information here about chromatophores in frogs, lizards and fish (vertebrates) and in invertebrates like octopi, cuttlefish and other cephalopods.