Can anyone tell me how to identify pure platinum?

■ How to identify platinum

In summer, platinum jewelry is a hot spot in jewelry consumption. Platinum and platinum are two different concepts.

Platinum is a precious metal with natural white. The annual mining volume of platinum is only one -twenty of gold, and a ounce of platinum needs to be refined from 10 tons of platinum ore. Domestic platinum jewelry usually contains 90 % of pure platinum and is hit with the "PT900" logo. Platinum white gloss is naturally natural, and long -term wearing will not fade. The hardness of platinum makes it the best friend of diamonds. White K gold is gold and some alloys are white. It only contains 75 % of gold. White K gold cannot be beaten on the PT logo, and it can only be marked by the purity of gold and purity according to its purity. For example: 18K white K gold can only play "18K" and "G750". In the international precious metal market, the price of platinum is far more than gold, and the highest price among all precious metals. In addition, some white jewelry may also be silver products or white metals plated on its surface. Over time, it may show the original appearance. Although platinum is sometimes commonly known as platinum, in a strict sense, it should be called "platinum". Platinum Platinum means chemical element platinum. Therefore, the purity, scarcity, durability, and its natural white luster of platinum are indispensable for white K gold.

. In fact, some jewelry marked "Platinum" in the market is actually not platinum jewelry, so when choosing, it is important to look at the mark in the jewelry.

■ Platinum identification

(1) Visual inspection method: Tags: Each jewelry should be engraved with chemical ingredients, such as (PT900) (PT750). The printing of the "PT" is the color of platinum jewelry: platinum is white, that is, white and gray, shiny
(2) Instrument detection: Test hardness: Platinum hardness is 4--4.5 degrees, the hardness of platinum is 4--4.5 degrees. Big gold, silver, scratches with small knives or glass, but will not be scratched by nails to scratch the density: the density of platinum is extremely large, the hand is sinking, and the test density of the static water mechanics should be 21.43g/cm. Cube burning: The melting point of platinum is as high as 1773 degrees. Put platinum on the alcohol or electric furnace. The color does not change the acid test: the platinum chemical properties are stable, insoluble in ordinary acids, and draw the platinum on the test gold stone, use hydrochloric acid hydrochloric acid Dripping, the grinding marks do not change the hydrogen peroxide: Take a little platinum powder, placed in a hydroxide bottle, the hydrogen peroxide immediately produces bubbles, the platinum after the reaction is not damaged, and you can still use

■ platinum. Seven characteristics

Platinum, because its unique character has always been regarded as valuable precious metals, in recent years, the International Platinum Association has strongly advocated, making it more and more important in the wedding ring.

In the ancient Egyptian era 3000 years ago, platinum had been widely used by people at the time. Archaeologists have discovered a platinum -made text on the coffin of Egyptian priests. After a long time, they can still be perfect and not lose their original luster, which fully proves the lasting and stability of platinum. After the first diamonds were dug out of the Kingsley mine in South Africa, platinum was very different.

This year, the Italian Platinum Association launched a series of new types of wedding matching, and proposed seven characteristics of platinum, indicating that platinum works are the best choice for becoming precious metals.

1. The highest purity

. 95 % of the pure platinum in the alloy of platinum and 75 % gold with a gold of 18K. A platinum jewelry has a higher purity than gold jewelry.

2. The rarer

The 140 tons of platinum in the world each year, while the annual production of gold is 3,300 tons.

3. Only the skilled craftsmen can make it. The melting point of platinum is higher than that of gold, so it is more proficient in the technical requirements of workers.

4. The most stable

. Platinum is the strongest metal with the strongest resistance to acid, alkali, high temperature, etc., and will not fade or change color. Platinum ring does not change

.

5. Good luster and ductility

Platinum has natural white and gloss, which will not affect the color of the gem, and it can make the gemstone release glory and "fire". Processing.

6. It will definitely not make the jewelry a allergic reaction.

7. Valuable and outstanding.

■ Platinum commonly used identification method

1, observation method method: pure platinum is white, bright luster, white K gold color is white beige, silver color is the color of silver White. The surface color can be distinguished.

2, hand oscillating method: platinum density reaches 21.45, through the test of the same volume material, platinum has a heavy feeling, it is heavier than gold (19.36), heavier than K platinum, and heavier than silver (10.45).

3, burning method: Platinum melting point reaches 1773OC, much higher than K platinum and silver. Generally, the welding gun cannot melt the platinum, and it can be identified to the authenticity. And platinum is unchanged after cooling.

4, tags: platinum jewelry has standard poke. Internationally use PT or PT, such as PT950 platinum color is 950 %.

5, gas natural method: Put the jewelry on the twisting gas stove, put it on a few minutes. If the jewelry becomes red and warmed up the gas stove, it is platinum products. This is because platinum can be used as a catalyst, which prompts the gas and air to oxidize the heat in the air, so that the platinum is warmed, red, and can ignite the gas.

6, point test method: A wipes mercury on platinum, platinum will not be contaminated, while gold and silver will be contaminated with mercury. B is placed in a hydraulic bottle in the edge or middle depression of platinum jewelry in the depression of the platinum jewelry. Platinum can be used as a catalyst to promote hypoxic decomposition, and the oxygen is released up and down.

■ Look at the mark of platinum

Platinum jewelry usually shows the texture of the jewelry with thousands of points, and is also one of the basis for jewelry pricing. Common tags are the following:

Footpladies: Platinum content is not less than 990, and "foot platinum" or "PT990" mark.

950 platinum: The platinum content is not less than 950, and the "platinum 950" or "PT950" mark is hit.

900 Platinum: Platinum content is not less than 900, and "platinum 900" or "PT900" mark.

The pure platinum hardness is small. In order to increase hardness, a certain percentage of precious metals such as 钯, 铑, and 铱 must be added. PT950 contains 铑, 0, and 铱 5 %, and the hardness is still relatively low. It is generally used in plain platinum jewelry; PT900 contains 钯, 铑, 铱 10 %, and hardness is just right for inlaid jewelry. At present, most platinum rings are PT900, but there are also a few manufacturers to make precepts for PT950.

The metals such as 钯, 铑, and 铱 are more rare and more expensive than platinum, so the PT900 is also higher than the PT950. However, many consumers have formed a habit of psychology in the past: the higher the purity of gold, the more valuable it is, and it is applied to the quality and price relationship of platinum. So some merchants used this to deliberately label the price of the PT950 than the PT900, misleading consumers to buy, so as to obtain returns, and it is unavoidable to be suspected of fraud.

■ How to identify platinum and silver jewelry?

The beautiful color of platinum and the most extended features, making it the main material for making jewelry. It is the characteristic of expensive rare, never fading oxidation, and stable nature. Because the color of silver and platinum is very close, it is easy to confuse from the appearance. The following briefly introduces some methods to distinguish between the two:
(1) Induction of printing and notes: Jewelry products are based on national standards, and they must be printed and their purity. mark. For example, there are "PT" or "Platnum" or "Plat" on the jewelry.
(2) Weight: The proportion of platinum is 21.4, and the proportion of silver is 10.49. The same volume of platinum is doubled than silver. Generally, the weight of the hand can be distinguished.
(3) Comparison of appearance and hardness: Platinum carefully observed with the naked eye will be slightly gray and white, with hard texture, it is difficult to scratch with large head needles. White, smooth and delicate, light oxidation will become gray -white or black black. Its Mo's hardness is 2.7, which is much softer than platinum.
(4) Fire burning method: Platinum can resist high temperature oxidation, and its melting point is as high as 1770ºC. It uses a general high temperature (gasoline) fire to burn without melting. After cooling, the color does not change or traces of quenching. The silver melting point is low. After the high temperature is burned, the color content is red, the color is red, black, or black.
(5) Chemical method: The chemical properties of platinum are extremely stable, corrosion -resistant, and cannot be reflected in any acid or alkali, while silver is not resistant to strong acid corrosion.

Pay content for time limit to check for freenAnswer 1 Metal markings: Only PT flags on Platinum metaln2 Look at the color method: It is also very intuitive to see the color. The fake platinum is black, and the color will be yellow or too silver.n3 Bend to look at the hard and hard method: Platinum is like gold, which has good ductility and can be made into the shape of your own desired. Therefore, bending hard and hard can also be used as a convenient and feasible test method.n4 The easiest way to directly look at the qualified label. There will be a heavy metal identification certificate when buying platinum. It will be clearly clear that the metal component is also the quality inspection unit, the date, etc. platinumnI hope it can help you! I wish you a happy life! If you feel helpful to you, please work hard to praise your fingers! Thank you ~ If you have any questions, you can click on my avatar to make one -on -one consultation.n3 morenBleak

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