small amount of substances aditional to the major components of wood which give timbers their own colour and odour. Resin is the best known.
Uuteaineet Extraktionsmedel A large number of different compounds in native wood (1-5 % of the raw material) which are soluble in organic solvents or water, for example aliphatic and alicyclic compounds (terpenes, terpenoids), phenolic compounds (stilbenes, flavonoids) and other diverse compounds (such as quinones etc.)
Compounds deposited in wood during the transition from sapwood to heartwood. Extractives give heartwood it's dark color, and sometimes impart decay and insect resistance.
Organic compounds in biomass that are either soluble in neutral organic solvents or water; compounds that are not an integral part of the cellular structure.
Chemicals within the cells of wood that can be gotten out by some form of treatment, often soaking in water. Walnut is an example of a wood that contains extractives. Often walnut logs or lumber are steamed or soaked so that extractives will move from heartwood, which contains the extractive which gives walnut its rich color, to sapwood which is normally white. The process makes the white sapwood as valuable as the dark heartwood, thus increasing the value of the lumber or logs. Two other species that contain water soluble extractives are Osage orange and sumac.
Minor substances ( 1-5 % of the raw material) present in native wood, i.e. resin acids, fatty acids, turpenoid compounds and alcohols. Most of these substances are soluble in water or neutral organic solvents.