For our fire weilding lasses. Green fire is usually for general evil and undead Purple and black fire are for really evil and hellfire can be any of the three colors. While 'spectral' is just green or blue (wil-o-wisp esk) but may be a bit more translucent this is just general things in haunted lore. Normal red is also common for hellfire.
It is "Spectral" fire... green fire many times warmer than normal fire. Capable of melting steel in seconds. and why then go against that theme xD Have it bee abyssal blue... or a dark blood red heck, why not make it multicoloured xD or black
As gm I'm indifferent to the color of your flames do with them as you wish. I will probably use that in some way.
Oh....so they do know I'm about to squish them most of the time.... (their eight legged ghosts are gonna come after me! )
That's why I said "using it for communication" She's irritated by using a sense spiders don't use for communication to communicate.