This mod changes the color of molten metal to a more appropriate, realistic color.
Molten iron is now bright yellow, while copper is light red. In real life, iron has a higher emissivity than copper, so I decided to reflect this in the mod, as well to keep some semblance of readability, with copper being the classic red color.
Unfortunately, making the pipes emit actual light and glow for real isn't an easy task with how Factorio deals with emissive color. Maybe I'll look into it in the future, but probably not.
Enjoy!