Foreword:
In addition to 24K pure gold, gold also has alloys with silver, copper and zinc. Example: A sample of 18K gold alloy contains 75% of the total weight of gold, and the rest is usually occupied by 16% silver and 9% copper. In addition to gold, silver and copper, the 14K gold alloy will have a little zinc alloy. Therefore, for gold and K gold recyclers, in order to recover the cost, the main gold recovery K is divided into three typical alloy samples: gold and copper, gold and silver, or gold and copper & silver. Therefore, 18K gold alloys also have different density values ​​and colors depending on their mixing ratio. In general, copper-bearing gold alloys appear reddish, silver-bearing gold alloys appear cyan, while copper and silver-bearing gold alloys appear yellow.
motivation:
The author understands the methods used by the silver floor operators, gold, K-gold recycling industry and pawnshops to identify the gold content.
First, non-destructive:
A, X-RAY scan gold alloy surface: According to the current model, the power is only 120w, because the power is too small, the thickness of the infiltrated scan is less than 30μm. Because the scan thickness is too thin for the gold package is not measured. And X-RAY has radiation concerns, which can cause damage to the human body.
B. Water scale method: According to the water replacement method of Archimedes, the density is determined, and the purity of gold contained in the alloy is judged. Since the alloy is the density of the mixing ratio, the formula has a certain algorithm. It is not the data obtained by simply hanging the gold in the water, and calculating the gold content of the gold to make a transaction. Such gold and K gold recyclers will pay more. We will discuss this for this.
If the pure gold density is 19.32, the silver density is 10.53, and the copper density is 8.90 g / cm3, what is the overall density of the 22k gold alloy? What is the overall density of the 18k gold alloy? What is the overall density of the 14k gold alloy? What is the overall density of the 12k gold alloy? What is the overall density of 9K gold alloy?
Second, destructive:
C, combustion method: (not discussed)
D, scratch surface method: (not discussed)
Glossary:
[Carat Carat] What is it: We also call it K number or open number. 1 carat is 1/24 of the weight.
Don't confuse the word "carat". It is a unit of weight in addition to being used as a unit for diamonds or other precious stones. Carats used in gold alloys refer to a weight ratio of 1 in 24 or 41.66 per 1000. The higher the carat number, the higher the ratio of gold to the base metal. Therefore, pure gold is equal to 24 carats.
[Purity purity] is what:
We are also known as the thousand feet or the color. In units of 1000. There is a so-called purity description of 999, even 999.9. Such as 750 is 18K, 585 is 14K...etc.
[Gold Gold] is what:
Gold itself is a yellow metal element and is a simple shape used for the inlay of general jewelry. It is a too soft metal. Although some cultures must wear pure gold jewelry, they need to be carefully designed when they are manufactured and used in large quantities. The reason gold causes golden yellow is because gold absorbs purple and blue light and reflects yellow and red light.
[Gold alloy] is what:
It is usually an alloy made by mixing gold with other metals, and it is a mixed metal of two or more kinds. Throughout history, most people like the color of gold jewelry, which is still close to pure gold itself. Therefore, most jewelry have used gold alloys over the years. Gold blends with other metals to produce alloys including copper and silver, which are the most common gold alloy components.
As for how to judge the amount of gold contained in the gold alloy, the following mistakes are understood:
A: The average person understands the gold alloy. The 18k gold alloy is 75% gold because it is 18/24, and the other is composed of silver and copper 6/24, which is equivalent to 100%. So, for the average person:
Gold: (0.75) × (19.3 g /cm^3) = 14.45 g/cm^3
Silver: (0.16) × (10.5 g /cm^3) = 1.68 g / cm^3
Copper: (0.09) × (8.9 g / cm^3) = 0.801g/ cm^3
Then, add them up: 16.96 =17.0 g/cm^3
Not what is its requirement? I understand that this calculation is wrong.
B: The silver building industry, the gold recycling industry, and the pawn shop operators all use the [water scale method], which is to put the product on the weighing pan to determine the weight of the sample in the air, and then place the container filled with water in the balance. After deducting the weight, the sample to be weighed is tied with a fishing line and then immersed in water. The water displacement method using Archimedes [the weight of water added to the sample into the liquid is the volume of the sample]. The density of the sample is then determined by W/V and divided by the gold density of 19.32 to determine the purity of the sample. Or directly use the formula of density conversion to K number to determine the K number of the sample.
Gold density × 1.2422 = K number. (19.32=24K). My understanding of this calculation is also wrong.
Technical data:
The combination of the three precious metals of gold, silver and copper in the market varies according to the approval standards of the products of each country. The silver and copper ratios that are ubiquitous now are about 1, silver 3: 7 copper. 2, silver 4: 6 copper. 3, silver 5: 5 copper three combinations. Below we will describe the combination of silver 3: 7 copper.
The theoretical basis of the [water scale method]:
The density of the gold contained in the alloy is determined by using the underwater replacement method of Archimedes to determine the density. The wrong [% by weight] method is generally used instead of the [% by volume] method. The total volume of gold, silver, and copper after the alloy is the sum of the individual volumes. Therefore, the gold number and purity we want are the overall density of the gold alloy after mixing. So we will compare the overall density of the samples at 22K, 18K, 14K, 12K, 9K and the water scale method between the gold and silver 3: 7 copper.
What is the overall density of A, 22k gold alloy?
What is the overall density of B, 18k gold alloy?
What is the overall density of C, 14k gold alloy?
What is the overall density of D, 12k gold alloy?
What is the overall density of E, 9K gold alloy?
analysis report:
A: What is the overall density of the 22k gold alloy?
22k purity and density range: 17.1309~17.7337
purity
density
purity
density
purity
density
purity
density
916
17.7337
900
17.4607
890
17.2942
880
17.1309
K number converted by water scale method
22K
22K
21K
21K
If the formula for converting the density to the K number is directly used: density 1 = 1.2422 (19.32 = 24K) K number conversion, the result obtained by using the [water scale method] is: the red number in the above table.
B: What is the overall density of the 18k gold alloy?
The 18k purity and density range is:
purity
density
purity
density
purity
density
purity
density
750
15.2580
740
15.1308
720
14.8826
710
14.7615
K number converted by water scale method
19K
19K
18K
18K
If the formula for converting the density to the K number is directly used: density 1 = 1.2422 (19.32 = 24K) K number conversion, the result obtained by using the [water scale method] is: the red number in the above table.
C: What is the overall density of the 14k gold alloy?
The 14k purity and density range is:
purity
density
purity
density
purity
density
purity
density
585
13.3988
570
13.2520
560
13.1559
550
13.0612
K number converted by water scale method
17K
16K
16K
16K
If the formula for converting the density to the K number is directly used: density 1 = 1.2422 (19.32 = 24K) K number conversion, the result obtained by using the [water scale method] is: the red number in the above table.
D: What is the overall density of the 12k gold alloy?
The 12k purity and density range is:
purity
density
purity
density
purity
density
purity
density
500
12.6074
490
12.5204
470
12.3499
460
12.2664
K number converted by water scale method
16K
16K
15K
15K
If the formula for converting the density to the K number is directly used: density 1 = 1.2422 (19.32 = 24K) K number conversion, the result obtained by using the [water scale method] is: the red number in the above table.
E: What is the overall density of the 9k gold alloy?
The 9k purity and density range is:
purity
density
purity
density
purity
density
purity
density
375
11.5998
360
11.4896
350
11.4173
340
11.3459
K number converted by water scale method
14K
14K
14K
14K
If the formula for converting the density to the K number is directly used: density 1 = 1.2422 (19.32 = 24K) K number conversion, the result obtained by using the [water scale method] is: the red number in the above table.
in conclusion:
Gold alloy products are based on their proportions, each with a different overall density value. From the above we can confirm two points:
A: The K number is above 18K. Using the [water scale method] to obtain the K value is close to the value of the product itself. B: The K number is below 18K. Using the [water scale method] to obtain the K value is different from the value of the product itself. And the smaller the K number, the bigger the gap.
Therefore, it is worth paying attention to recycling manufacturers:
[Not a single point of pure gold density 19.32 = 24K directly converted K number as the basis for buying and selling. 】
We hope to do our best for the silver building industry, gold, K gold recycling industry, and shoppers.
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