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... and heating to boiling point. The solution then must be cooled to room temperature with occasional stirring to effect crystallisation. The crystals are filtered out and will be found to contain laevo enantiomorph, which is the left of a pair of crystals that are a mirror image of each other. It is then recrystallised and the predominance of the l-enantiomorph is found to be increased and the process is repeated until no further change is effected and a concentration of 8 grams per 100 cc of aqueous solution is obtained. Finally the product obtained is l-amphetamine d-tartrate. d-amphetamine may be recovered from this by the addition of tartaric acid for the formation of acid tartrates and separation of d-amphetamine d-bitartrate by crystallisation. Properties and Chemical Reactions of Amphetamines Amphetamines vary from a white to brown colour, though sometimes a purple or orange. It comes in the form of powder, tablets, capsules, ...