Gold jewelry appraisal content many, gold and silver jewelry appraisal, Jinyuanmorphological identification, cultural identification, identification of gold jewelry, goldjewelry gold jewelry processing technology maintenance identification etc.. Describedin this chapter is gold jewelry appraisal.
The so-called appraisal, is through observation, test mark the conclusive opinions.Gold jewelry identification is different from the data detection, is drawn and measurement of the digital. It emphasis on grades, authenticity, rather than thepercent content. The identification of samples differ in thousands of ways, such assome gold products, but not decorative; some precious metal content is low, do not meet the definition with a precious metal based, but this chapter still take them all inJinyuan jewelry appraisal content, because this is the gold jewelry appraisal mustmeet.
An ancient jewelry, probably because of cultural value is high, even if is gold-plated,than they would be worth a hundred times of gold. To identify this aspect by specialized departments of cultural relics, has nothing to do with the finenessidentification. A novel K gold jewelry, gold weight than the old style jewelry more expensive. To identify the shapes, styles, style by specialized jewelry designer,appraisers and experienced jewelry business, it has nothing to do with theidentification referred to in this chapter.
Identification of gold jewelry should be intact. Different sampling to analysis andtechnical supervision Materials Chemistry Department of gold jewelry. The identification of any gold jewelry can not damage the decorative and preservation.
Gold jewelry identification history
Gold jewelry appraisal of ancient are simple facial observation method. This kind ofmethod has been passed down to the present, many local folk with the method ofidentification of the authenticity of pure gold jewelry.
Bite: this method slightly injured. By using properties of soft texture of gold and silver.If brass or other alloys, hardness greater than gold and silver, so it can be used to identify the teeth. Teeth to bite gold less likely possibility; bite immobile.
See: gold, silver, copper, iron, gloss than tin to light, from the color also can tellwhether it is true gold silver.
Hand OK: gold jewelry density, in the hands of Shen Dian Dian; is the silver jewelryoften than common metal jewelry weight. This is one of the most rough density method.
Listening: percussion kyg jewellery or gold jewelry landing, the sound is stuffy, than other metal sound is ringing, this is because gold and silver density, strong toughness, affected by the vibration frequency is slightly lower than other metal.
Hand: this method with damage. With teeth, is the use of gold and silver.
In addition, with the development of science, folk also added some other method to distinguish the authenticity of gold jewelry.
Fire: the characteristics of high melting point of gold. With injury.
The water in the silver: Gold density is far greater than the mercury. Folk also used this method to collect the gold.
Using touchstone: actually observing kyg jewellery streaks. Folk also have use a magnifying glass to see streak.
Drops of hydrogen peroxide solution: such as platinum products, the products intohydrogen peroxide in severe blistering. This method is the use of catalytic platinum.
Drops of concentrated nitric acid: the characterization of gold does not dissolve innitric acid quality.
There are some methods are not scientific, but folk circulate erroneous reports. For example:
The tongue taste: it is said that gold is sweet, other metals are tasteless or bitter. Thismakes no sense, the solubility of gold is very low, the tongue root can’t taste any flavor.
Touch cold: it is said that gold and silver are warm, other metal is cool. It also makes no sense. Heat transfer of gold and silver, rate is very high, but also the thermal conductivity of high compared to other metals, feel with the hand to determine the authenticity of gold and silver is not easy, and even can be said to be impossible.Because the winter and summer surface temperatures of different physiological hand,feeling the hand will send an error, but gold and silver in winter and summer air temperature change, by hand and the lack of objective criteria to judge.
With the development of science, gold jewelry identification method is in constant development and improvement. Tianze gold by instrument identification andprofessional inspection gold division examination.