What are the different kinds of Ecstasy you can get? What are the different colors for? Which ones the worst?

I dont want ppl to say...ohhh its bad for you.dont do it..I didnt say I was going to do it, im just interested in learning about it.

: http://alcoholdrugstreatment.info/what-are-the-different-kinds-of-ecstasy-you-can-get-what-are-the-different-colors-for-which-ones-the-worst