From the site:

You've seen artificial candles with LED lights that glow with different colors... hey we sell a few here at ThinkGeek. But how about torches with honest to goodness real fire that burn in green, red or purple? These Colored Flame Stainless Steel Table Torches forgo the standard boring yellowish fire color in favor of something a bit more interesting. Right out of a wizard's laboratory (or a high school science class lesson), the torches achieve their special color from a combination of various salts and metals that tint the flame when they burn. You get one stainless steel torch, and a 250ml bottle of oil in your color preference... enough for a burning time of 4 hours.