I think this is lightsaber science?
Kyber crystals aren't actually burning, it's more of an amplification and emission situation, so I would call lightsaber science more in the realm of optics, rather than chemistry
I have seen green ones and white ones, but I didn't know they could be purple or red or orange. I hope I see a purple one.
Pro tip, you can look at any lit object in the sky with a spectroscope and read the light waves of the burn to see what it's made of.
And a spectroscope is easy to make! https://astro3d.org.au/education-and-outreach/diy-smartphone-spectroscope/