Ten methods to identify the authenticity and quality of platinum jewelry

1) Look at the color test

According to the quality, it is generally divided into three colors, blue, white and slightly gray. The original color is higher; the bluish white and slightly yellowish color is that platinum contains gold or copper, and the color is lower; the white silver color is that platinum contains more silver, and the color is lower than the above.

Two kinds. The false ones are black.

2) Fire test

Platinum can only burn red when placed in a normal fire, but cannot melt. After burning, those with a color of more than 95% will have the same color and gloss, and will become brighter as they are burned. Those with a color of about 70% will turn slightly black. The fake ones turn jet black and melt easily.

3) Weighing and specific gravity test

The specific gravity of platinum is 21.4, which is the crown of metals. It is 10% heavier than gold and heavier than other metals. It is easy to weigh it out by hand.

The color of the knot is determined. If it is lighter, it is either fake or of low quality. Furthermore, the specific gravity test can also be used. The specific gravity test is the same as the specific gravity test for identifying gold

.

4) Listen to the phonological test

Pure platinum, when struck by fire, will make a "Toto" sound, which has no rhyme, while impure gold will make a "ding-ding" sound.

The sharper sound has sound and rhyme.

5) Look at the stubble test

Use tweezers to cut the jewelry in half horizontally, and then bend it and there will be sticky (sticky) stubble. The higher the color, the softer the stubble, and the

second time stubble will be sandy and crispy when cut.

6) Bend to see the softness and hardness

Platinum, like gold, has very good ductility and can be beaten into platinum foil with a thickness of only 0.0025 mm, 20 sheets as thin as this

p>

The platinum foils are stacked together and are only as thick as a page. Therefore, bending soft and hard can also be used as a test method.

7) Nitric acid and salt test

Grind the platinum on the touchstone, add a small amount of salt on the platinum path (just cover half of the gold path), and then add < /p>

Nitric acid, add it until the salt is completely absorbed by the nitric acid, wait for 15 minutes, and rinse away the salt and nitric acid with clean water. If it’s platinum, if it’s 95% or more of fineness, the gold pattern remains the same; if it’s about 90%, the gold pattern will change slightly and is slightly blurred; if it’s 95% or more, the gold pattern will be gold

The road turned black and gray, and a layer of it was corroded away.

8) Mercury wipe test

The scientific name of mercury is mercury, and it is commonly known as mercury in my country. Utilize the characteristics of gold and silver to absorb mercury, while platinum does not absorb mercury (under normal temperature). Apply mercury on the gold channel. If it does not absorb, it means it is real platinum. If it is absorbed, it is gold. Or

counterfeit products made of silver.

9) Gaslight test

Platinum acts like a match and can be used to test the authenticity of platinum. Gas lamps are lit by matches. If you put a piece of real platinum on a gas lamp, after a minute or two, the white gold will turn red and the gas lamp will light up. If the platinum is fake, it will not glow red and the lamp will not light.

This is because platinum has the characteristic of accelerating many chemical reactions and can be used as a chemical catalyst. Coal and oxygen in the air are difficult to combine directly at room temperature.

But with platinum catalysis, it is difficult to combine directly. , it can slowly combine, release a lot of heat, make the platinum block red, and finally light the gas lamp.

10) Hydrogen peroxide test

If platinum is in powder form, put a little in hydrogen peroxide and it will become real platinum. The white waves will immediately roll and decompose a large amount of oxygen, making it white

There is not a lot of gold powder at all. If it is false, it will not change.

When specifically identifying platinum, the above methods can be used in combination, and the fineness can be determined after careful study.

Answer: ftsky - Assistant Level 2 2-11 21:26