Pure amphetamines are white, odourless, bitter-tasting crystalline powders. Illicitly prepared amphetamines vary in purity. They may be whitish with traces of gray or pink and may be a coarse powder, or in crystals or chunks. They may smell “fishy” or like ammonia. Methamphetamine resembles shaved glass slivers or clear rock https://chemstore.com.au/product/speed-amphetamine/