Identification of gold to a certain experience. Simply introduce some identification method. But the best thing is to shop! Jewelry equipment
(1) color: gold jewelry purity is high, the more dark color. In the absence of gold under the general condition can be determined according to the following criteria tocolor (green gold. The so-called green gold is the only containing silver gold yellowcolor); internal components. In more than 95%, pink yellow 90--95%, yellow 80--85%, yellow green and 65 - 70%, the color green with white light only 50--60%,micro yellow and white is less than 50%. Seven green, eight yellow, nine red usually said for reference. Jewelry equipment (2) weigh weight: the proportion of gold19.32, silver, copper, lead to, zinc, aluminum and other metals. As the volume ofgold than silver weight above 40%, is 1.2 times heavier than copper, 6.1 times heavier than aluminum. Gold jewelry in the hands of care should sink sense, goldjewelry will feel light. This method does not apply to mosaic stones of gold jewelry.
(3) see hardness: pure soft, low hardness, nail a shallow scar, teeth can leave teeth marks, high fineness of gold jewelry than the low quality of soft, copper containing more and more hard, bending method can also test hardness, gold is soft, easy to bend, the purity is lower, more not easy to fold bending. Jewelry equipment
(4): listen to the voice quality in more than 99% of the gold to hard throwing, sendsthe Dalai sound, sound no rhyme nor stretch. False or low quality of golden voice brittle without depressing feeling, general issued a "Dangdang" sound, but thesound is lingering sound, after landing severe beating.
(5) with fire: fire will identify jewelry red (don’t make jewelry melting deformation),color change after cooling was observed, such as surface is still the original goldcolor is pure gold; such as dark or different degrees of black, is not pure gold. The general lower fineness, the color is more concentrated, all black, that is fake goldjewelry. Jewelry equipment
(6) see Mark: the domestic gold jewelry are in accordance with internationalstandards and prepared, and play on stamps, such as "24K" marked "pure" or"gold"; 18 karat gold, marked "18K", quality is lower than loK, shall not play goldmark. In society at present commonly used outlaws create false brand, imitation stamp, with thin gold, silver, and brass as gold, so gold ornaments to identifycomprehensive decision to determine the true and false and quality level according to the sample. Jewelry equipment
There are two kinds of identification methods of fineness of gold jewelry.
Test method: (1) choose the delicate texture of black touchstone, standard assaysheet for gold content ranging from (for gold) scratched on the touchstone, thenthe identification of gold samples in the same touchstone scratches, drops of concentrated nitric acid to remove impurities, found in assaying stone marks andplan the assay sheet trace comparison, find the color like jewelry sample, the control sample of gold standard, the gold content is accurate for the determination of gold sample. Jewelry equipment
(2): also known as chemical reagent point test. Gold does not dissolve in nitric acid,sulfuric acid and hydrochloric acid alone, silver, copper and other components arenitrate reacts with dissolved. Take the gold sample. The nitrate in a site, such asgold will not change color, such as silver products, will generate silver and black;such as copper products, generating two valent copper salt and take the green bubble. The gold content of gold jewelry in the more than 95% specimens, with nitric acid, surface changes very little. Jewelry equipment