If you didn’t know, compounds containing metal ions emit a certain wavelength of light when heated (this depends on the arrangement of electrons), and some emit a wavelength in the visible spectrum, producing colour. For example, copper can create a blue-green flame, and potassium can produce a lilac flame.
Has there been any attempts at artificial colouration of flame colours in certain products that could be used to indicate safety certification, temperature ratings of that specific appliance/equipment, make visible to what would otherwise be colourless flames, etc.?
I know something similar is done with certain gases, colourless and odourless gases that are dangerous (flammable, toxic, etc.) are given distinctive colours and/or smell.
Methane gas is given an additive to produce an odour to detect leaks, but the blue flame is just from burning methane.
I don’t see a practical application. You can buy powders that color camping flames but that’s just a toy.