Colored Flame Dyes from Homeofpoi
Homeofpoi has found a great supplier for Colored Flames: Tribal Neon Fire Dyes.
I used the green flame with a fire puppet at the Halifax Busker Festival, and the effect was fantastic. Homeofpoi looked far and wide before choosing Tribal Neon. The colors are very strong.
If you use them, make sure to read the directions carefully. I used it with "Methyl Hydrate," which is basically pure methanol, with great success. The names of these products change in different regions, so you might need to do some homework to find the right thing. Enjoy!