Because the higher the purity of silver, the whiter the silver is, and the surface luster and polishing of jewelry are uniform. If it contains lead, the jewelry will be bluish gray; If it contains copper, the surface of jewelry will be rough and the color will not be moist.

Step 2 consider

The weight of silver is relatively large in metals, and the density of silver is slightly higher than that of ordinary metals, 10.53 g/cm3, so it has a heavy feeling when held in the hand, which can be distinguished by weighing.

3. Draw the inconspicuous place of silver ornaments with a fine needle.

If you can't row, there is no trace, it is probably copper; If it is easy to draw and leave a deep mark, it is probably made of lead and tin. Similarly, we can also use the hardness of silver to detect it by bending.

4. Look at this sign

Silver ornaments are generally stamped with the English abbreviation of silver ("S" or "Sterling"). The mark of standard silver is S925 or 9.25 or 925. The imprint of foot silver is S990. But there are also many countries that don't print paper money on silver ornaments. Or 9.25925 marks. There are also thousands of silver labels or S999.

Step 5 use chemical methods

Drop nitric acid on the file mouth of silver jewelry with a glass rod, and the dark color is brown rice, dark green or light green; Light colors are dark green or even black.

Extended data:

Silver decoration restores the original luster;

(1) polishing method: This method is better for plain silver head injuries, such as flowerless bracelets and collars. When polishing, you can use silk or toothbrush dipped in a small amount of toothpaste to polish it repeatedly at the place to be polished until the surface of the jewelry is as clean as new, and then wash it with water after polishing. However, this method is not very effective for ordinary carved or carved silver ornaments.

(2) Put some pieces of broken aluminum under the silver ornaments, then put them into soda solution and heat them together to remove the black. Because soda is very alkaline and heated, this method cannot be used for silver jewelry with jewelry.

(3) After cleaning with 1% hot fat room solution, soak the silver ornaments with sodium thiosulfate solution (photographic fixing solution, also called Haibo), and then wipe them with toothbrush or fiber cloth.

(4) If the black on the jewelry is heavy, it can also be washed with concentrated hydrochloric acid. After washing, it should be washed with clear water immediately. Jewelry inlaid with pearls, malachite and turquoise must not be washed with hydrochloric acid, otherwise it will damage the jewelry.

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