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I don't know if it's the paraffin itself, but other colored flame products rely on specific metals that give the different hues as they burn.

That's what I guessed too DJLucky after the first pic, and their website confirms that some of their products are metal-based solutions. Same technology as fireworks.

But they also have special paraffin oils as well that might be a slightly more well-guarded secret.

I'm a bit paranoid about burning items, especially if I don't know why they're burning a different color, so I'll stick with the colored LEDs. The come in a lot of colors now, take very little energy to burn, and last for years.

These are pretty -- and they remind me of my Chemistry class back in school.

Totally bad-ass.

I saw a "flame" light fixture in a bar in Rome a few years back.

As near as I could tell, it was a sconce type fixture with a fan integrated underneath the bulb socket - maybe colored LEDs. The fan moved a thin piece of "flame" cloth (silk?) around in the light, giving it the appearance of a real flame. No soot worries.

There's something similar in the States called the Chauvet Bob Flame Light.