In the early years of the Sui Dynasty, one kilogram was equivalent to 668. 19 grams, and one or two kilograms was equivalent to 4 1.76 grams. At the end of Sui Dynasty, one kilogram was equivalent to 222.73 grams, and one or two kilograms was equivalent to 13.92 grams. From the Tang Dynasty to the Qing Dynasty, one catty was equivalent to 596.82 grams, and one or two was equivalent to 37.30 grams.
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Tips for distinguishing the purity of gold;
1, look at the color
Gold products above pure gold have a natural metallic luster. If the color is bluish yellow, it means that the gold is mixed with copper. If the color is white, it is mixed with silver. But iridium or tungsten doping can't tell the difference just by looking at the color.
Step 2 listen
If you throw thousands of gold on the concrete floor, it will make a dull snapping sound, and there is no rhythm, commonly known as "dead sound." The sound of low-quality or adulterated gold products will have rhyme, sharp and long voice, and there are signs of rebound.
Step 3 bake on fire
As the saying goes, real gold is not afraid of fire. Bake the gold bars on the fire for a while and observe their color changes. If it contains iridium or tungsten, the color of gold bars will turn gray, while the color of pure gold will turn bright red after baking.
4. Look at this part
Cut the gold bars or jewelry with scissors, and then observe the section with a magnifying glass. If you see bright white spots, it means that gold is doped with iridium. Generally, diagonal cutting is used, otherwise the iridium hidden at both ends or in the middle may not be visible.
Baidu Encyclopedia-Ancient Currency
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People's Network-Five Ways to Distinguish "Adulterated Gold Bars" from Pure Gold and Impure Gold