1, see color
According to the different gloss and color of gold can generally distinguish between pure
gold, K gold, gold, fake gold. Red yellow or gold to better than 95% purity; is about 80%
purity yellow; green yellow about 70% purity; yellow slightly gray around 50% purity. It has
formulas for the "seven green, eight yellow, Sept. 5 red, yellow vaginal discharge gray on the
semi-metal." Early on for long if the jewelry is out, there "copper green, silver and black,
Jin Ziyong far color itself."
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Second, look at the density
The density of gold is 19.32 grams / cubic centimeter, compared with the volume of silver,
lead, tin, about twice as heavy. Available formula: a certain quality of gold jewelry (grams)
of gold jewelry than on certain volume (cubic centimeters) is equal to the density. Calculated
by measuring the density of gold jewelry, a density of 19.32 grams / cubic centimeter or more
gold around was pure gold, or shall be non-pure gold or in gold color (this method of jewelry
without any destructive).
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3, folding hardness
Gold has the characteristics of ductility and hardness of small, 12.7 micron thickness can
be pressed into the sheet. Condition is high, carved with a pin or nail can be a trace. More
than 97% purity of gold jewelry, bent two or three times, the bend occurring at the wrinkles,
also known as fish-scale pattern; 95% purity of gold jewelry, feel the hard time bending, fish
scale pattern is not obvious; 90% purity of gold jewelry, when bending hard, no fish-scale
pattern; with a lot of impurities in the gold jewelry, bent or broken two or three times; like
living gold production, bending or breaking, sand-shaped cross section significantly. Method
has been applied taking into account the width of jewelry and thickness, thick, wide, some of
the hard, thin, narrow on the softer.
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Fourth, listen to phonology, see elastic
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High purity of gold jewelry by knocking or to the hard-throwing, the issue of "Choo despair,
pop despair," the dull whisper, with no rhyme, no stretch, K Kim has phonological, audio, there
are elastic, elastic greater phonological The more pointed the more elderly, the fineness of
the worse.
5, with the touchstone of identifying Condition
Use of gold on the cards (identified fineness of gold), and jewelry were tested on the
touchstone of grinding Road, by comparing the color to determine the purity of gold jewelry.
This method should be carried out under natural light and fluorescent light, not in direct sun
light and under incandescent light.
6, with acid point
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The touchstone of grinding have been identified, respectively, and the licensing of gold
jewelry Road, nitric acid test point with a glass rod in the gold trail, for Gold in the
chemical stability, not with acid reaction, so the color change. Either gold or pure gold, Gold
Road, then disappear or to change. Variation is the "three fast, three slow", that is, the
disappearance of low fineness fast, slow the disappearance of high purity; mixed gold
disappears quickly disappeared behind the Qing Jin; large mixed gold disappears quickly, Xiao
Hun Kim disappeared slowly. Disappear as the Golden Road, the situation
Conditions, compared to the fineness of gold jewelry brand can be determined.
