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Typical ambers and its applications |
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| Release time:2013-09-05 Source:admin Reads: | |
| Amber is a precious material to make jewelries which is fossilized tree resin, which has been appreciated for its color and natural beauty since Neolithic times. Much valued from antiquity to the present as a gemstone, amber is made into a variety of decorative objects with jewelry cards. Amber is used as an ingredient in perfumes, as a healing agent in folk medicine, and as jewelry. There are five classes of amber, defined on the basis of their chemical constituents. Because it originates as a soft, sticky tree resin, amber sometimes contains animal and plant material as inclusions. The word originally referred to a solid waxy substance derived from the sperm whale. The sense was extended to fossil resin circa 1400, and this became the main sense, as the use of ambergris waned. The two substances were confused, because they both were found washed up on jewelry cards. Ambergris is less dense than water and floats, whereas amber is less dense than stone, but too dense to float. When gradually heated in an oil-bath. Two pieces of amber may be united by smearing the surfaces with linseed oil, heating them, and then pressing them together while hot. Cloudy amber may be clarified in an oil-bath, as the oil fills the numerous pores to which the turbidity is due. Small fragments, formerly thrown away or used only for varnish, are now used on a large scale in the formation of "amberoid" or "pressed amber". The pieces are carefully heated with exclusion of air and then compressed into a uniform mass by intense hydraulic pressure; the softened amber being forced through holes in jewelry cards. The product is extensively used for the production of cheap jewelry and articles for smoking. This pressed amber yields brilliant interference colors in polarized light. Amber has often been imitated by other resins like copal and kauri gum, as well as by celluloid and even glass. |
