Mixing Cold Light
When you mix three cups of red, green, and blue paint, you get a muddy brown. But when you mix together three cups of cold light, you get white.
The cold light is giving off its own light through a chemical reaction called chemiluminescence, whereas the cups of paint are only reflecting nearby light. It’s like the difference between the sun (which gives off its own light) and the moon (which you see only when sunlight bounces off it to your eyeballs).
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I’m wondering why we don’t use a yellow light stick instead of green.
This is one of the trickiest parts of understanding light. In the artist world, the three primary colors of paint are red, yellow, and blue.
When you mix light (not paint), you need red, green, and blue.
This small change is a world of difference between mixing paint and mixing light. It’s just the way the universe is wired. I do recommend getting a yellow light stick and seeing what happens when you substitute it for green…
Can’t wait to do this with the children. Any idea where to get these glow sticks. I can’t think of anywhere at the moment, myself. thanks from Sanders14
Yes – you can get true color glow sticks here.