Colours...............

I am just wondering if anyone knows if pills with similar colours have the same effect regardless of the stamp or imprint?

Nope, colour is irrelevant, as is shape, or texture and size too (to a certain degree).

its just dye. the taste and to a certain degree smell are more important. by the questions your asking robert you should read a faq. there are many out there but you could read this one for a basic low down on everything.

Occasionally there will be interesting stories like when a dealer chucks a handful of some pill they want to get rid of quickly into a bag of other decent pills of the same colour and says "Yeah one in every 20 is stamped (the other logo) because the manufacturers forgot to change one of the pill press dies"... or whatever excuse they're using
BigTrancer
------------------
"What they're trying to do with radio, with this, uh, McCarron-Walter Act and a lot of other ways, is start by saying that they're protecting the public from wicked rock bands, or girlie magazines, or whatever. But, if you follow the chain of dominoes that falls down, what they're really trying to do is shut off our access to information itself. If they can't do it by law they know there's other ways to do it."