The chief constituent is a volatile oil, of which the herb yields in distillation from 0.5 to 1.0 per cent. It is usually dark green, or sometimes blue in colour, and has a strong odour and bitter, acrid taste. The oil contains thujone (absinthol or tenacetone), thujyl alcohol (both free and combined with acetic, isovalerianic, succine and malic acids), cadinene, phellandrene and pinene. The herb also contains the bitter glucoside absinthin, absinthic acid, together with tannin, resin, flavonoides , starch, nitrate of potash and other salts.
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