Been Dying for 25 years now
I'll give you my secret sauce :friendly_wink:
The Best Way to Dye Plastic is use Sharpie permanent markers .99 cents each
or you could use "Indian Ink" which is much more expensive
Any Color You Want
Remove the Inside Ink cartridge from the Marker
For small parts I use 2 Markers to a 1/2 cup of water in a small sauce pan
Bring to a boil and place the Ink Cartridges into the water and squish out the ink with a spoon
Depending on how dark you want it, small parts take 2 Ink Cartridges
where as larger parts will take up to 5 cartridges............
"RIT DYE" = $3.99 a bottle with only 8 colors
"Sharpie" = .99 (or less) any color you want even Gold
Best Regards, Rick