What causes the blue-white glow?

The blue-white glow happens when something super hot shines through tiny holes or cracks.

Imagine you have a laser pointer, that red dot it makes is pretty bright, right? Now imagine instead of one laser, there are hundreds of tiny lasers all shining together. That’s kind of what happens with the blue-white glow. It comes from something very hot, like a fire or a light bulb filament, and it shines through tiny spaces, making a really bright, colorful light.

Think about a sieve, that thing you use to strain pasta. If you put a tiny bit of light through the holes in the sieve, it spreads out and becomes brighter. That’s like what happens with the blue-white glow. The hot object is like the fire inside a light bulb, and the tiny spaces are like the holes in the sieve. When the light goes through those little openings, it becomes super bright, that’s why you see the blue-white color.

If you’ve ever seen light go through a window or a curtain, you know how it can spread out and look brighter, that’s kind of what happens here, but with even tinier holes!