re: Colored VinylBeen a while since I've posted, but had to chime in on this one....
Colored (non black)Vinyl is no different from black vinyl from the same manufacturer. The vinyl is origianally a mostly transparent substance until dye or pigment is added to it. So even black vinyl is colored vinyl. If you can still see through it after pressing, it most likely was dyed (a liquid - think food coloring or ink) and if it isn't transparent it is most likely had pigment added (a solid - think paint powder). The Beatle's White Album is a pigment treatment I believe. I'm certian that the Blue Elvis albums had a dye treatment.
If you look a most of the colored album pressings you don't like, they are probably not from the same company/label as the black pressings of the same album you do like.
(on a side note, JVC, whose vinyl is considered above average, is the only company I know of that uses black dye instead of black pigment.)