Glowing Eyes
Vanilla Scorchlanders have slightly glowing eyes. This is achieved by color green over their eyes in the head mask texture. Also colors white, grey and yellow show glowing on the head texture. Mixing in black will dilute the glow brightness. But as you see on the grey-scale you need to put quite a lot black in to see a difference. So maybe it just is the darkness of the color that does the diluting and not necessarily the amount of black.
Testing different colors gave this result.
Glowing Body
Unfortunately there is no glow color for the body, so if you need glowing parts on the character body, you have to make the entire mesh UVs to belong to the head texture (or maybe just the glowing bits?). If you do that, you probably will mess up the part map and thus also all the blood splatters the game paints on the character. Meaning the character cannot have its parts invisible under clothing and no blood splatter on its skin. I am pretty sure it also affects shirts.
