A small red candle burns brightly as it faces the crushing force of a hydraulic press. The contrast between the delicate ...

When they get hot enough, these chemicals glow a particular color like red, green, purple, or blue. Here, there is a regular candle in the middle and special color-flame candles on either side.

[cpldcpu] hooked a photodiode to his oscilloscope, pointed it at a candle flame, and recorded the result. The first interesting observation was the candle slowly changed brightness, whether it was ...