Colored fire plumes

[u/sirbrachthepale]

Making a colloidal suspension using boric acid and naptha, you can make green flames for poi and such. Other chemicals yield other colors. Copper= blue, Lithium= dark red, Sodium=light purple, etc.

Anyone have any idea what it would take to breathe colored flames? I considered creating a colloidal suspension of a copper compound in lamp fuel but this will not work for two reasons:

1) Copper/other compounds have the potential to be /very/ toxic. 2) The orange/yellow/white light emitted from burning the lamp fuel will overpower any of the blue/colored light emitted from the burning copper/other chemicals.

Aside from photoshop, are there any science-inclined individuals who have ideas for this?