<P> Pine tar consists primarily of aromatic hydrocarbons, tar acids and tar bases . Components of tar vary according to the pyrolytic process (e.g. method, duration, temperature) and origin of the wood (e.g. age of pine trees, type of soil and moisture conditions during tree growth). The choice of wood, design of kiln, burning and collection of the tar can vary . Only pine stumps and roots are used in the traditional production of pine tar . </P> <P> Pine tar has a long history as a wood preservative, as a wood sealant for maritime use, in roofing construction and maintenance, in soaps and in the treatment of carbuncles and skin diseases, such as psoriasis, eczema, and rosacea . </P> <P> Pine tar has long been used in Scandinavian nations as a preservative for wood which may be exposed to harsh conditions, including outdoor furniture and ship decking and rigging . The high - grade pine tar used in this application is often called Stockholm Tar since, for many years, a single company held a royal monopoly on its export out of Stockholm, Sweden . It is also known as "Archangel Tar". Tar and pitch for maritime use was in such demand that it became an important export for the American colonies (later United States), such as North Carolina, which had extensive pine forests . North Carolinians later became known as "Tar Heels ." </P> <P> It was used as a preservative on the bottoms of wooden, Nordic style skis until modern synthetic materials replaced wood in the construction of such skis . The pine tar also helped the adhesion of waxes which aided the grip and glide of such skis . </P>

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