[brijar]

I thought it said in the article or video that they were using a Lightscribe DVD burner. Maybe I'm crazy, though. Those do have lasers on the top to burn off pigments on Lightscribe DVDs. I would guess that they put the liquid solution on the DVD, let the water/carrier evaporate overnight or so, then use the Lightscribe DVD burner to burn off the oxygen in the carbon compound. But that's just a guess.