Sandarac

Sandarac (or sandarach) is a resin obtained from the small cypress-like tree '' Tetraclinis articulata''. The tree is native to the northwest of Africa with a notable presence in the Southern Morocco part of the Atlas mountains. The resin exudes naturally on the stems of the tree. It is also obtained by making cuts on the bark. It solidifies when exposed to the air. It comes to commerce in the form of small solid chips, translucent, and having a delicate yellow tinge. Morocco has been the main place of origin of sandarac. A similar resin is obtained in southern Australia from some species of the Australian cypress-like trees '' Callitris'', but the resin has not been systematically collected in Australia.''Analysis of Resins, Balsams and Gum-Resins''
by Karl Dieterich (1920), Chapter II, Section 34. Dieterich states he heard a report "that Mogador (i.e. African) sandarach is better and purer than Australian. This may be the reason why the latter has not been more utilised." But Dieterich's own chemical analysis leads him to conclude that "great similarity exists between the two kinds".

Historically, especially in the Late Medieval and Renaissance era, sandarac was used to make varnish. When "varnish" was spoken of in Renaissance Italy (Italian ''vernice'') it usually meant sandarac. Copal and other resins displaced it as equally good, less expensive varnishing materials. Nevertheless the sandarac varnish is still valued today for use as a protective coating on paintings and antiques. It gives a coat which is hard, lustrous and durable. The varnish is made by melting the resin and mixing it with (e.g.) linseed oil. Sandarac resin melts at about 150°C to a colourless or slightly yellow liquid. Its specific gravity is about 1.04.

In mid-to-late 19th century photography, a varnish was applied as a preservative to photographic negatives and positives. Sandarac resin was preferred by some photographers for this purpose.

Although it is not very strongly aromatic, sandarac resin was and is also used as an incense. The aroma has been compared to balsam.

Besides the resin and the varnish, the word sandarac may refer to the tree that produces the resin. Entirely separately from that, the ancient Greeks and Romans used the word ''sandarac'' to refer to arsenic sulfide particularly red arsenic sulfide. In medieval Latin the term ''sandaraca'' meant red lead as well as red arsenic sulfide.''Original Treatises, Dating from the XIIth to the XVIIIth Centuries, on the Arts of Painting, Volume I''
by M.P. Merrifield (1849), including pages ccliii and cclxvi. The word's resin/varnish meaning came to Europe from Arabic in the early 16th century. To distinguish this meaning from the Greek and medieval Latin meaning, it was occasionally called "Arabian sandarac" or "sandaracha Arabum" in New Latin writings. The name in Pakistan and India is چندرس and Arabic was and is سندروس ''sandarūs''.''Sandarūs'' was a resin is in medieval Arabic writers including Ibn Sina (died 1037) and Ibn al-Baitar (died 1248); see سندروس in medieval Arabic texts a
AlWaraq.net
(in Arabic).

References

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Resins
Varnishes
Incense material