Resin, not to be confused with rosin, is a hydrocarbon secretion of many plants, particularly coniferous trees. It is valued for its chemical constituents and uses, such as varnishes and adhesives, as an important source of raw materials for organic synthesis, or for incense and perfume. Fossilized resins are the source of amber.
The term is also used for synthetic substances of similar properties. Resins have a very long history and are mentioned by both ancient Greek Theophrastus and ancient Roman Pliny the Elder, especially as the forms known as frankincense and myrrh. They were highly prized substances used for many purposes, especially perfumery and as incense in religious rites.
Uses
The hard transparent resins, such as the copals, dammars, mastic and sandarac, are principally used for varnishes and cement, while the softer odoriferous oleo-resins (frankincense, elemi, turpentine, copaiba) and gum resins containing essential oils (ammoniacum, asafoetida, gamboge, myrrh, and scammony) are more largely used for therapeutic purposes and incense.
Resin in the form of rosin is used for the upkeep of bows for stringed instruments (i.e. violin, viola, cello, double bass), because of its quality for adding friction to the hair. Ballet dancers may apply crushed rosin to their shoes to increase grip on a slippery floor.
Resin has also been used as a medium for sculpture by artists such as Eva Hesse, and in other types of artwork.
Also, resin is used in some skateboard decks. It makes the skateboard more durable, making it less likely to get pressure cracks, chippings, or break in half.
Conservators use resins to consolidate fragile items such as bone found on archaeological sites. The resin acts to bind the fragile material inside its molecular structure. In Pompeii, resin is now used instead of plaster to recreate the bodies of Mount Vesuvius' victims, because it is more durable.
Source: www.tiarasakti.co.id
Tidak ada komentar:
Posting Komentar