pastel

Hello! I just got a new betta from a local fish store, and he is very beautiful! But as I moved him from his cup to his tank , I noticed his color changed depending on how the light hits it. He can go from blue to pink to green! I was wondering what this coloration would be called.

I can't figure out what color my fish Cain is, his blue eyes just mess me up. I was thinking he was cellophane or pastel, but considering they usually have black eyes I wasn't sure, and also I don't think he's albino because he doesn't have red in the middle of his eyes. I'm just really...

Went in for decor, came out with fish... :roll: He was listed as a HM but we'll see when he calms down and flairs proper for me. I'm thinking of naming him Opal. He's very small so he must be young. I've got him in a 1 gallon now with a heater. Anyone know what color he is? He baffles me.