does pbt resin come in various colors?

[forlornsoul]

are pbt key caps made from colored resin or made from white resin then dyed?

i found some pics of colored resin but they seem to come in only red, green, white, yellow, blue, oranage.

[Oobly]

Solid colour, they are usually not dyed, although they do accept dye well.

I think some of the "rainbow" sets may be white that has been dyed, but I am not certain of that.