Pure amphetamine powder is white, but street speed rarely is, typically because street speed can be less than 15% pure. Impurities are usually the result of the drug being cut back (mixed with other, cheaper substances) by dealers, or due to poor synthesis techniques. It is not uncommon for street speed to be off-white, yellowish or brown in colour, although these are not the only variations. While the colour is by no means a gauge for what is in your speed, some causes of discolouration are listed below. It should be noted that some dealers add food colouring to their product to make it seem more appealing or merely for ease of identification.
* RED: The product was made from pseudoephedrine tablets, and the red colouring of the tablet was not adequately washed away (it is difficult).
* ORANGE: Ephedrine sulphate was used, and some of the sulphate was reduced to sulphur.
* PURPLE: Iodine from a phosphorus-iodine reaction was not washed out.
* GREEN: Copper (or other metallic) salts somehow made their way in to the mixture, probably due to the reaction vessel used in the manufacture.
* BROWN: Oxidized red colouring (see above), or tabulating agent was present in the reduction.
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