Be familiar with several concepts before you say it. Hard resin: A fresh resin juice is dried to form a hard resin. Coba resin: Hard resin is buried in the ground, after tens of thousands to millions of years (some more than 10 million years), the formation of semi-petrochemical resin. Amber: Hard resin is buried in the ground, after tens of millions of years to hundreds of millions of years, completely petrochemical resin fossils.
The difference between amber and coba is reflected in hardness, density, melting point, color, texture and chemical reagents. Amber hardness of 2.5-3.0, density of 2.5-3.0, melting point of 200-280 ° C, dissolved in liquid state at about 150 ° C, when the highest point is reached, black ash is fired. The color is darker and the texture is tighter. The more polished it is, the more the acetic acid and benzene agent are dropped. Coba grease hardness 1.0-2.0, density 1.03-1.08, melting point 150 ° C, color lemon white, texture is loose, polishing is not smooth, cracks appear on the surface in a short time, the water loss rate is ten times more serious than amber. When the acetic acid and benzene agents are dropped, the surface will soften.
The most effective means of identifying amber and coba is to use chemical reagents. A drop of ether (or absolute alcohol) is applied to the surface of the amber, and the real amber does not react. Coba resin will quickly appear sticky spots (smooth surface becomes mushy), and it has a sticky hand feeling by hand; Coba resin is more sensitive to alcohol, and becomes sticky when it is dripped on its surface. It is a polished product and the surface becomes opaque. Amber has been petrified and is fossil. The ingredients are very stable and do not dissolve in organic solvents. Coba resin is only semi-petrochemical, the composition is not stable enough, and it can be partially dissolved in organic solvents.
After reading the amber and coiba fat above, the intuitive feeling is: the color of amber is deep, the color of coba is light yellow; the amber is not big, and the 15cm of coba is also very common; there are many cracks in amber, and Ke The balsam is very clean, with only a few bubbles; there are fewer amber worms and a lot of cobs.
The formation of amber experienced the process of resin > coba lipid > amber. The resin secreted from the trees is polymerized in one drop and finally hardened to form coba. Coba lipid is buried in the soil or sediment and forms amber after a long period of petrification. This petrochemical (forming fossil) process requires at least 2 million to 10 million years.
Coba is a resin that is less than a year old. It can also be divided into two types. One is a resin that has not been fully petrified from 1 to 10 million years ago, and it is called “true coba lipidâ€; the other is raw coba. Lipid is completely a modern product. The use of carbon 14 for copa lipids from Colombia and South America is even less than 250 years old.
Coba lipid is often sold as amber because it contains insects or other wraps, but the insects contained therein are generally the ones that still exist. Since the petrochemical has not yet formed amber, its price is naturally different from that of natural amber. Everyone should keep their eyes open when buying. Many jewelers make cobs into various kinds of accessories because of their beauty and easy processing. Relatively speaking, petrochemical amber is not so easy to process and is easy to break.
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