Black vs. Colored Vinyl


I've picked up pieces of various threads about the different quality of vinyl used to make LPs.  What I've heard said is that the best vinyl to use is black, and that colored vinyl doesn't have the sonic quality of the traditional black vinyl.  Given that colored vinyl is all the rage these days and countless reissues of LPs we likely have multiple copies of anyway are hitting the market trying to encourage us to purchase yet another limited release, I thought I would reinvestigate the topic.  Anybody know of a quality resource that defines the different types of vinyl?  I heard about some vinyl back in the 70's used to make LPs that could be folded over like wonder bread being poor quality, and other LPs from the era that are solid and unbendable being good quality.  But today's market with all the groovy colors is a whole new world.  What y'all say?
pgaulke60
Thanks for chiming in slaw about the flattening.  What flattener do you have?  The guys at the record store swear that with their Orb unit they have problems with colored vinyl.
@big_greg,

I have an ORB,

These devices need thoughtful consideration regarding their use.

It's more a problem with inconsistency with vinyl formulations.
@slaw Thanks!  I know you're one of the resident experts on vinyl flattening.
The picture discs (a picture encased in clear vinyl) I've heard (Elvis Costello, Dave Edmunds) sound terrible. But they're made to look at, not listen to.
I tried playing a couple of picture discs and agree that a turntable's stylus should not be placed on them.