新葡京棋牌官方网站注册
News
澳门新葡京娱乐801.com
Contact Us-88919.com-澳门新葡京娱乐4138.com-新葡京棋牌官方网站注册-澳门新葡京娱乐801.com

CONTACT��Mr Huang
MOBILE��15915683896
TEL��0663-8295896
E-MAIL��347339970@qq.com

Your position��Home > News > Industry News

General methods for identification of jades-新葡京棋牌官方网站注册-澳门新葡京娱乐801.com

date��2017-8-12  Hits:378

In the identification of jade, generally speaking, its identification methods are divided into two major categories, namely, conventional identification methods and special identification methods.
In the identification of jade jewelry, the routine identification method is a project that needs to be tested in the process of normal inspection. Comprehensive assessment of the results of each project to ensure the accuracy and uniqueness of the test results. Routine identification includes visual observation, magnification examination, refractive index, birefringence analysis, light characteristics, color identification, density and so on. In the appreciation of jade and jade trade, the commonly used means of identification are generally classified as conventional identification methods.
Generally speaking, the identification of jade should be from hardness, transparency, color, luster and other aspects of view, the real jade relative to the forgery, it is very hard, wear-resistant, crystal clear, pure color. The surface fold, internal bubbles, light weight, hardness and so on, are fake jade common features.
Here is a detailed description of the commonly used jade identification methods:
First, the concept of gloss: true jade, whether translucent or opaque, there are moist gloss, grease gloss, patterns of natural, internal fiber status is not easy to imitate. If there is a small amount of impurities or internal clamp is cottony patterns are normal; fake jade color dry, dull and gloomy aura, there are some bubbles;
Two, measuring hardness: with knife carving and scraping, true jade without leaving traces. A glass plate (5.5 Mohs) as the standard, in addition to jade, turquoise, general can draw streaks on the glass plate, and the jade itself intact. The false jade is softer and cannot touch the glass.
The common fake jade is usually made of plastic and glass. They are all amorphous materials. They are of low hardness, low density, and have the essential characteristics of materials. Such as plastic can carry with the needle, or can be carved in the hands of light scratches. The glass displays bubbles in the light or sunlight. The polarizer shows amorphous (without periodic changes in light and shade). The material has a vortex like streak.
Three, twist ratio: real jade handle heavy, fake is buoyant. This is in fact related to the density of jade. The jade structure is fine, while the false jade is made of plastic and glass. Compared with the volume, the true jade weighs much more than the weight of its forgery;
Four, listen to the sound: the jade wire hanging, struck with a hard object, genuine voice of melody, lingering melodious; fake is relatively dull and dry.
Five, fracture: 10 times magnification, uneven fracture really jade, visible structure is fine; fracture of fake jade neat and shiny, usually glass imitation, rough fracture structure, waxy luster is stone imitation.
In general, accurate identification can be obtained by the identification of the authenticity and the quality of the jades by the conventional methods of jade identification. However, in some special cases, special identification methods will be adopted if the conventional identification methods can not be solved. The special identification method is not suitable for all the jade identification, but a targeted identification method. For example, some jade has special thermal conductivity, it can distinguish jade jade according to the performance of different conduction and true and false; some special chemical properties of jade because of its structure, composition and composition of certain chemical substances or foreign substances will react according to the phenomenon and the extent of this reaction is different, we have you can identify jade "; it is worth noting that some special identification may cause different damage to the sample, so be careful, now also used spectral analysis to identify the principle of special identification valuablejade, called nondestructive identification. Is also a very good means of technical identification.

Prev �� the first