happy vs. stressed

[gusthebus]

what is the difference between happy and stressed colors? i have heard that bright yellowy colors tell that they are happy but i have also heard that that means they are stressed what is the line between joy and stress?

 

[armando]

My veiled gets bright green when he is happy
and black/ darker green/ yellow marks when he is stressed or angry

 

[nightanole]

Normally spots or high contrast lines means stressed. Extreme white may mean over heating, and extreme black may mean too cold. Other than that there is body language. Tail unwound(or curled on a branch) with 4 feet on the tree, body thin, its a happy cham. Tail curled up in a ball, with 1-2 front feet in the air, and body buffed up(even without chin out) is stressed. On the other hand tail wound up while sleeping is normal, and back arched is normal.