A few dye ideas and an idea for multiple dye slots

Dark metallic colours: red, blue, purple, yellow, orange green

Bronze metallic dye, pure white/black metallic dyes

Pastel yellow/orange dyes (I imagine orange will be like a peach colour)

Pure dyes: purple, blue, green, pink, yellow, orange, (has a glossy/shine effect to it)

As for the dye system in order to ease things on Devs multi dye systems could just be locked to glamour only items. Like craftable, reward, Mogstation, and event items.rather than ever item piece in the game.

Slot one: is the base dye (standard dye that changes everything)
Slot two: changes the larger details such as, cloaks, undershirts, etc
Slot three: changes belts and shoulder pieces
Slot four: changes the smaller details such as engravings and embroidery.

Because some items kinda get worse after you dye them.