#usually when high

Throws lithium chloride into Hades’s hair

Lmfao oorrrrr you could fluster him. His flames hair are not actual fire (that would be hestia) his are the materialisation of a soul.

Cause in my canon souls are represented with fire and Hades having soul hair is like him having part of his soul in display.

Hades is a non emotional guy btw. (It's one of the side effect of being swallowed by kronos and overworking himself.) He lost the ability to express emotions long ago. Instead, the hair flame is like a mirror of his soul. What he truely feels. (Tho the feeling has to be intense to truly change color)

Here are some big emotions :

Persephone sighing: it's pride month and I can't even see my colorful husband.../j