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Sandalwood is a class of woods from trees in the genus Santalum. The woods are heavy, yellow, and fine-grained, and, unlike many other aromatic woods, they retain their fragrance for decades. Sandalwood oil is extracted from the woods for use. Sandalwood is the second-most expensive wood in the world, after African blackwood.[dubious ] Both the wood and the oil produce a distinctive fragrance that has been highly valued for centuries. Consequently, species of these slow-growing trees have suffered overharvesting in past centuries.
Sandalwoods are medium-sized hemiparasitic trees, and part of the same botanical family as European mistletoe. Notable members of this group are Indian sandalwood (Santalum album) and Australian sandalwood (Santalum spicatum); others in the genus also have fragrant wood. These are found in India, Nepal, Bangladesh, Pakistan, Sri Lanka, Australia, Indonesia, Hawaii, and other Pacific Islands.
- S. album is a threatened species indigenous to South India, and grows in the Western Ghats and a few other mountain ranges such as the Kalrayan and Shevaroy Hills. Although sandalwood trees in India, Pakistan, and Nepal are government-owned and their harvest is controlled, many trees are illegally cut down. Sandalwood oil prices have risen to $2,000 per kg recently. Red sanders is endemic to Seshachalam, Veliganda, Lankamala, and Palakonda hill ranges, distributed in districts of Kadapa, Chittoor, and Kurnool in Rayalaseema region and parts of Nellore and Prakasam in Andhra Pradesh, Mysore region of Karnataka (formerly Mysore State), and marayoor forest in Kerala, southern India, is high in quality. New plantations were created with international aid in Tamil Nadu for economic exploitation. In Kununurra in Western Australia, Indian sandalwood is grown on a large scale. This species is the primary source of sandalwood used in commercial oil production and should not be confused with West Indian Sandalwood, Amyris balsamifera.
- S. ellipticum, S. freycinetianum, and Santalum paniculatum, the Hawaiian sandalwood (ʻiliahi), were also used and considered high quality. These three species were exploited between 1790 and 1825 before the supply of trees ran out (a fourth species, S. haleakalae, occurs only in subalpine areas and was never exported). Although S. freycinetianum and S. paniculatum are relatively common today, they have not regained their former abundance or size, and S. ellipticum remains rare.
- S. spicatum is used by aromatherapists and perfumers. The oil concentration differs considerably from other Santalum species. In the 1840s, sandalwood was Western Australia’s biggest export earner. Oil was distilled for the first time in 1875, and by the turn of the 20th century, production of Australian sandalwood oil was intermittent. However, in the late 1990s, Western Australian sandalwood oil enjoyed a revival and by 2009 had peaked at more than 20,000 kg (44,000 lb) per year – much of which went to the fragrance industries in Europe. Although overall production has decreased, by 2011, a significant percentage of its production was heading to the chewing tobacco industry in India alongside Indian sandalwood – the chewing tobacco market being the largest market for both oils in 2012.
- Other species: Commercially, various other species, not belonging to Santalum species, are also used as sandalwood.
Various unrelated plants with similarly scented wood or oil include:
- Adenanthera pavonina - sandalwood tree, red or false red sandalwood
- Baphia nitida - camwood, also known as African sandalwood
- Eremophila mitchellii - sandalwood; false sandalwood (also sandalbox)
- Myoporum platycarpum - sandalwood; false sandalwood
- Myoporum sandwicense - bastard sandalwood, false sandalwood
- Osyris lanceolata - African sandalwood
- Osyris tenuifolia - east African sandalwood
Producing commercially valuable sandalwood with high levels of fragrance oils requires Santalum trees to be a minimum of 15 years old (S. album) the age at which they will be harvested in Western Australia – the yield, quality and volume are still to be clearly understood. Yield of oil tends to vary depending on the age and location of the tree; usually, the older trees yield the highest oil content and quality. Australia likely will be the largest producer of S. album by 2018, the majority grown around Kununurra, Western Australia. Western Australian sandalwood is also grown in plantations in its traditional growing area in the wheatbelt east of Perth, where more than 15,000 ha (37,000 acres) are in plantations. Currently, Western Australian sandalwood is only wild harvested and can achieve upwards of AU$16,000 per tonne, which has sparked a growing illegal trade speculated to be worth AU$2.5 million in 2012.
Sandalwood is expensive compared to other types of woods, so to maximize profit, sandalwood is harvested by removing the entire tree instead of sawing it down at the trunk close to ground level. This way wood from the stump and root, which possesses high levels of sandalwood oil, can also be processed and sold.
Sandalwood oil has a distinctive soft, warm, smooth, creamy, and milky precious-wood scent. It imparts a long-lasting, woody base to perfumes from the oriental, woody, fougère, and chypre families, as well as a fixative to floral and citrus fragrances. When used in smaller proportions in a perfume, it acts as a fixative, enhancing the longevity of other, more volatile, materials in the composite. Sandalwood is also a key ingredient in the "floriental" (floral-ambery) fragrance family – when combined with white florals such as jasmine, ylang ylang, gardenia, plumeria, orange blossom, tuberose, etc.
Sandalwood oil in India is widely used in the cosmetic industry. The main source of true sandalwood, S. album, is a protected species, and demand for it cannot be met. Many species of plants are traded as "sandalwood". The genus Santalum has more than 19 species. Traders often accept oil from closely related species, as well as from unrelated plants such as West Indian sandalwood (Amyris balsamifera) in the family Rutaceae or bastard sandalwood (Myoporum sandwicense, Myoporaceae). However, most woods from these alternative sources lose their aroma within a few months or years.
Isobornyl cyclohexanol is a synthetic fragrance chemical produced as an alternative to the natural product.
Aboriginal Australians eat the seed kernels, nuts, and fruit of local sandalwoods, such as quandong (S. acuminatum). Early Europeans in Australia used quandong in cooking damper by infusing it with its leaves, and in making jams, pies, and chutneys from the fruit. In Scandinavia, pulverised bark from red sandalwood (Pterocarpus soyauxii) is used - with other tropical spices - when marinating anchovies and some types of pickled herring such as matjes, sprat, and certain types of traditional spegesild, inducing a redish colour and slightly perfumed flavour.
Present-day chefs have begun experimenting in using the nut as a substitute for macadamia nuts or a bush food substitute for almonds, hazelnuts, and others in Southeast Asian-styled cuisine. The oil is also used as a flavor component in different food items, including candy, ice cream, baked food, puddings, alcoholic and nonalcoholic beverages, and gelatin. The flavoring is used at levels below 10 ppm, the highest possible level for use in food products being 90 ppm.
Sandalwood must be distilled so that the oil can be extracted from within. Many different methods are used, including steam distillation, water distillation, CO2 extraction, and solvent extractions. Steam distillation is the most common method used by sandalwood companies. It occurs in a four-step process, incorporating boiling, steaming, condensation, and separation. Water is heated to high temperatures (140-212 °F) and is then passed through the wood. The oil is very tightly bound within the cellular structure of the wood, so the high heat of the steam causes the oil to be released. The mixture of steam and oil is then cooled and separated so that the essential oil can be collected. This process is much longer than any other essential oil's distillation, taking 14 to 36 hours to complete, but generally produces much higher quality oil. Water, or hydro, distillation is the more traditional method of sandalwood extraction which involves soaking the wood in water and then boiling it until the oil is released. This method is not used as much anymore because of the high costs and time associated with heating large quantities of water.
Indian sandalwood is very sacred in the Hindu Ayurveda and is known in Sanskrit as chandana. The wood is used for worshipping the god Shiva, and it is believed that goddess Lakshmi lives in the sandalwood tree. The wood of the tree is made into a paste using sandalwood powder, and this paste is integral to rituals and ceremonies, to make religious utensils, to decorate the icons of the deities, and to calm the mind during meditation and prayer. It is also distributed to devotees, who apply it to their foreheads or necks and chests. Preparation of the paste is a duty fit only for the pure, so is entrusted only to priests when used in temples and during ceremonies.
The paste is prepared by grinding wood by hand with granite slabs shaped for this purpose. With the gradual addition of water, a thick paste forms (called kalabham "കളഭം" in Malayalam language and gandha ಗಂಧ in Kannada) and is mixed with saffron or other such pigments to make chandanam. Chandanam, further mixed with herbs, perfumes, pigments, and some other compounds, results in javadhu. Kalabham, chandanam, and javadhu are dried and used as kalabham powder, chandanam powder, and javadhu powder, respectively. Chandanam powder is very popular in India and is also used in Nepal. In Tirupati after religious tonsure, sandalwood paste is applied to protect the skin. In Hinduism and Ayurveda, sandalwood is thought to bring one closer to the divine. Thus, it is one of the most used holy elements in Hindu and Vedic societies.
Sandalwood use is integral part of daily practices of Jainism. Sandalwood paste mixed with saffron is used to worship tirthankar Jain deities. Sandalwood powder is showered as blessings by Jain monks and nuns (sadhus and sadhvis) to their disciples and followers. Sandalwood garlands are used to dress the body during Jain cremation ceremonies. During the festival of Mahamastakabhisheka that is held once in every 12 years, the statue of Gommateshwara is then bathed and anointed with libations such as milk, sugarcane juice, and saffron paste, and sprinkled with powders of sandalwood, turmeric, and vermilion.
Sandalwood is mentioned in various suttas of the Pāli Canon. In some Buddhist traditions, sandalwood is considered to be of the padma (lotus) group and attributed to Amitabha Buddha. Sandalwood scent is believed by some to transform one's desires and maintain a person's alertness while in meditation. It is also one of the most popular scents used when offering incense to the Buddha and the guru.
In sufi tradition, sandalwood paste is applied on the sufi’s grave by the disciples as a mark of devotion. It is practiced particularly among the Indian Subcontinent disciples. In the Tamil culture irrespective of religious identity, sandalwood paste or powder is applied to the graves of sufis as a mark of devotion and respect.
Chinese, Korean, and Japanese religions
Sandalwood, along with agarwood, is the most commonly used incense material by the Chinese and Japanese in worship and various ceremonies. However, some sects of Taoists, following the Ming Dynasty Taoist Manual, do not use sandalwood (as well as benzoin resin, frankincense, foreign produced) incense and instead either use agarwood, or better still Acronychia pedunculata, in worship. In Korean Shamanism, sandalwood is considered the Tree of Life.
Zoroastrians offer sandalwood twigs to the afarganyu, the urn in which the fire is kept at the fire temple (called agiyari in Gujarati and dar-e mehr in Persian), to keep the fire burning during religious ceremonies. After the firekeeping priests complete the ceremony, attendees are allowed to come up to the afarganyu and place their own pieces of sandalwood into the fire. Fire has been a sacred symbol in the Zoroastrian religion since ancient times and it is considered very important to keep the fires in the temples constantly burning. Because of its high sensitivity to fire, sandalwood works very well for this. Also, the wood has been accepted by the Yasna and Yashts as an appropriate fuel for the fire. It is offered to all of the three grades of fire in the fire temple, including the Atash Dadgahs. Sandalwood is not offered to the divo, a smaller lamp that is kept in the homes of Zoroastrians. Often, money is offered to the mobad (for religious expenditures) along with the sandalwood. Sandalwood is called sukhad in the Zoroastrian community. The sandalwood in the fire temple is often more expensive to buy than at a Zoroastrian store. It is often a source of income for the fire temple.
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- The Ming Dynasty Taoist manual 《天皇至道太清玉冊》 states: 「降真香，乃祀天帝之靈香也。除此之外，沉速次之。信靈香可以達天帝之靈。所忌者，安息香、乳香、檀香，外夷所合成之香，天律有禁，切宜慎之。」 ["Acronychia pedunculata is the spiritual incense of offering to the Heavenly Emperor. Apart from this type, agarwood/aloeswood (Aquilaria malaccensis) then Aquilaria sinensis are the next best. It is believed that this spiritual incense can ascend to reach the spirit of the Heavenly Emperor. Those that are to be avoided are benzoin resin, frankincense, sandalwood, foreign produced incense that violate the Heavenly Law and so one must be careful to observe this."]
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