Pressed pills sold as Ecstasy are colored by the food color dyes they use when creating large batches of pills. These are often used to distinguish 1 batch of pills (yellow) from a later created batch (blue), but can have the same logo (stamp) from the pressing process.
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It will come in all colors. Its actually supposed to be more natural if its in a yellow state. Due to the advances in the extacy field you can no longer tell.