Copper Chloride, not too bad, Lithium Chloride - Expensive!
Strontium Nitrate might work, but I suspect these effects will get a bit lost in a big fire - OK on a small fire in the hearth I should think.
Anyone tried it?
I tried some copper sulphate on a small fire heap, copper sulphate will kill the flame. And make your fire stink.
Copper sulphate will also not last very long, you'll get a burst of blue, then it'll die down to green, then back to whatever colour you had to begin with.
I think next time around, a paste mixture of oxidiser and your colourant will help with the fire.
won't potassium chloride produce a purple flame ???/
if so thats the answer - i can get a kilo of that no problem....
failing that, i guess its gonna be copper sulphate.....green it is !
Potassium chloride is not strong enough.
And will kill the fire without sufficient fuel/oxidiser.
Don't try Copper Sulphate, especially if you're going to use lots of it!
It will make the fire stink of sulphur and it will also most likely kill the bonfire and not last very long.