This one of yours is not dyed, it may be artificially optimized the day after tomorrow. The optimization of agate means that this agate is originally white, and there are some elements in natural stone more or less. These elements will change under high temperature irradiation, and the most obvious change is the change of color. This discoloration does not add any ingredients to the original stone, so the national industry standard recognizes that this high-temperature treated spar is still natural, and almost all agates will undergo this high-temperature treatment. So sometimes I hear people say that the rock crystal ornaments are fake, but in fact, rock crystal ornaments will naturally fade or change color if they are often exposed to the sun. If it is dyed with chemical reagents, it is absolutely unacceptable and harmful to the body! If you have worn this for three years and the color hasn't changed much, it must be true, don't worry.
Agate dyeing scheme China has regarded red agate as genuine since ancient times. Before the Western Han Dynasty, agate was called "ruby" or "ruby", which means "red".
Since the 1960s, Germany and the United States have used various methods to "make up" ordinary agate to make it have beautiful colors and stripes. Agate is called "umbu" in Brazil after dyeing. Green agate, black agate and blue agate are mostly dyed. East red agate imported from ancient China is red agate formed by heating iron-containing agate, so it is also called "burning red agate". Natural colors are mainly red, amber and white. Among them red is the best. The blue-purple agate jewelry sold in the market is not true, but dyed after processing, and will fade after several years of use.
agate
The dyeing of agate is called optimization method in national standards. You can call it by its name directly without explanation in the identification certificate. The dyeing of agate is to immerse the pigment into the pores inside the agate, so that the agate is colored as a whole.
(1) Agate used for dyeing must meet the following requirements.
1. It is structurally required that agate has a low structural density, and this variety with micropores is easy to be colored, while high-density pigments are not easy to immerse and add color. Advanced people studied its structure with electron microscope and put forward "three colors and five colors" Third, agate with herringbone rib-like long fibers can be colored with good results. Agate with wavy long fiber structure can be colored. Many generations of agate with slender fiber structure can be colored. Fifth, agate with non-oriented short fiber granular structure, variegated spherulite structure and irregular unequal granular structure can not be colored. The timely particles in the center of agate cannot be colored. The timely particles in agate are coarse, with clear grain boundaries, dense particles and no micropores. Can not form a channel, can not be colored.
2. Color In order to dye agate into the color people need, the raw material of agate must be light or white, and it should be cleaned. If it is dyed black, the color of agate raw materials can be darker.
3. The agate to be colored in the heat history must be the agate that has not been baked, and the baked agate is difficult to be colored.
(2) Requirements for pigments
Whether organic dyes or inorganic pigments are used to add color to agate, these pigments are required to have the following characteristics:
1. Soluble in water or other reagents;
2. It can react with some chemical reagents to form a precipitate insoluble in water and alcohol, and the precipitate is colored;
3. The generated chromogenic substance has good stability and will not be decomposed and destroyed by sunlight, air, water, oxidant and reductant.
(3) Dyeing method
There are three ways to dye agate:
1. dye is directly immersed in agate, and then decomposed by heating, oxidized or reduced to generate colored oxide. If you want to dye agate into apple green, you can soak agate in nickel nitrate solution and then heat it, and the generated nickel oxide is green.
2. Two chemical reagents that can react chemically to generate colorants are soaked in agate twice, and the generated colorants can be decomposed into colored oxides or simple compounds after heat treatment. For example, in the blue-green dyeing method, ammonium dichromate generated by the reaction between potassium dichromate and ammonium carbonate is decomposed by heating to generate chromium trioxide.
3. First soak a colorant in agate, and then soak it with a fixing agent, so that the colorant reacts with the fixing agent to generate an insoluble color-developing compound, and the agate is colored. This method does not need high temperature heating, and the generated precipitate requires good stability.
(4) Identification characteristics of dyed agate.
The color of dyed agate is not inherent in agate itself, but artificially added, just the color deposited in the pores of agate, which can generally be identified from the following two aspects:
1. The color of dyed agate is different from that of natural agate, and the color of agate dyed with organic dyes is far from that of natural agate. Organic dyes are bright in color and easy to fade, showing obvious "false color". At present, the colors of inorganic pigments used are closer to natural products, but the differences can be found by careful observation. Judging from the three common colors, the differences are as follows: natural red agate is positive red, and so is "red-burned" agate, which is pure in color, while artificially dyed red agate is red by artificially adding iron ions, often with a yellowish hue. Blue agate, less natural products, mostly sapphire blue, often with different degrees of silk winding. However, the artificially dyed blue agate is violet due to the addition of cobalt salt, that is, blue has purple tone, and in rare cases, there is sapphire blue dye, which needs further amplification observation and other detection methods to determine. The color of dyed green agate is very close to the color of natural products. However, careful observation will reveal that natural products are green and soft in color, while agate dyed green is emerald green and colorful.
2. Because the dyed agate is soaked and dried by pigment, the pigment is deposited in the pores of agate, and uneven color spots can be found in cracks and pores under enlarged conditions. Generally, it can be identified with a magnifying glass of ten times, and fine dyes should be observed under a gem microscope. Because of the limited value of agate, large instruments are generally not used for testing.
In a word, agate dyeing process is made by mixing colorants into liquid, infiltrating into colorless agate and heat treating. Green agate can be dyed with chromium dye, blue agate can be dyed with cobalt dye, and natural red agate can turn bright red after "burning red" heat treatment. Colorless agate can be dyed green, blue and red is hungry black. Green is dyed by blue cobalt ions dyed by chromium ions. The dyed agate is not only bright in color, but also makes the boundary between the ribbon and the color ring in the original agate very blurred and the color becomes uniform.
How to identify true and false agate ornaments?
(1) Transparency: The transparency of real agate is not as good as that of synthetic agate, which is a little messy, and some can see natural waterlines or "clouds", while synthetic agate is as transparent as glass balls.
⑵ Weight: Real agate jewelry is heavier than synthetic agate jewelry.
⑶ Temperature: Real agate is warm in winter and cool in summer, while artificial agate changes with the outside temperature, which becomes hot in hot days and cool in cold days.
Is this dyed with agate? hello
I seem to have answered the same question for you.
The dyeing of agate is a recognized behavior in treasures. The coarse red agate is dyed as follows.
Agate is a granular crystal, and there are some tiny gaps in the crystallization space, which is different from ordinary single fine crystals. Therefore, it is feasible to soak agate in the crystal gap with metal salt solution. The most important method is to acidify it by heating, or soak it in a second liquid to make it undergo inorganic dyeing reaction. In short, if the colorant can't penetrate into the crystal gap, the purpose of dyeing can't be achieved. In the dyeing method of red agate, some Ma Yao raw materials have high iron content and will turn red after heating, but most of them do not have this condition or will not turn red. So soak the solution of ferric nitrate or the first ferric salt for one month, then soak it in sodium nitrate for about two weeks, then dry it, and then heat it for acidification, and it will turn red.
Agate discoloration is allowed by the national standard, and it is also possible to wear it for fun.
I hope the answer can help you.
Method and technology of agate dyeing: Because agate has compact crystal structure, hard texture and complex mineral composition, it is changed by artificial heating, and the metal components in agate are oxidized and discolored. Artificially heated agate, recognized as natural agate, is the only stone species in jewelry and jade that admits that artificial optimization does not change its properties.
Is this string of agate artificially dyed? Manual, wholesale the highest one in 2 yuan.
All the techniques about agate dyeing! Agate is a granular crystal, so there is a block next to it, which belongs to chalcedony scientifically. Its specific gravity is not fixed, about 2.6, and its refractive index is 1.539 to 1.544.
Agate has different colors and textures, one is grayish white with relatively uniform color, and the other is very clear lines. Others such as manganese dioxide is black agate, iron is red agate, and chromium is green agate, but colored agate is rare, mostly translucent and grayish white. And colored agate is more acceptable according to consumers' habits, so there will be agate dyeing, which will be mentioned later. Let's talk about the origin of the name agate. It has existed for a long time since its birth and has been unearthed all over the world. Its English name is (agate), and the river in Sicily, Italy, where this treasure was discovered in ancient times was named (achate), so it was extended to today's English name (agate). Most of these treasures found in Chinese mainland are horse brain-shaped, so our ancestors named them agate.
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Agate has been used as ornaments and utensils to decorate the body since ancient times, and it was a series of shackles in the period of Emperor Wu of the Han Dynasty-made of white, agate made of A Le, and white glass made of saddle. Before the Qing Dynasty, it was also used as a button for robes, and modern Japanese kimonos also used agate as a button, as was Kesaya, a monk. Agate itself has good conditions and is also used in industry, such as grinding high-order pigments and scraping the yellow surface with agate. Buddhist ornaments-twisted beads, hand beads, tantric dzi beads, especially Muslim twisted beads especially prefer red agate. Agate carvings, pendants, bracelets, face rings ... all have considerable output and are loved by people from all walks of life.
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Agate dyeing is a recognized behavior among treasures, but other treasures are not. However, the treatment of treasure needs to pay attention to its permanence and stability, which requires high technology and experience. The dyeing of agate should be acidulant or inorganic dye such as carbon, and the stability should be increased.
1at the beginning of 925, two small towns in west Germany, Ida Oppenstein and Jiafu in Japan, probably discovered the dyeing methods of agate with various colors at the same time. Agate is a granular crystal, and there are some tiny gaps in the crystallization space, which is different from ordinary single fine crystals. Therefore, it is feasible to soak agate in the crystal gap with metal salt solution. The most important method is to acidify it by heating, or soak it in a second liquid to make it undergo inorganic dyeing reaction. In short, if the colorant can't penetrate into the crystal gap, the purpose of dyeing can't be achieved.
[img]:htrwh。 /BBS/attachment/2006 07/agate-05 . jpg[/img]
In the dyeing method of red agate, some Ma Yao raw materials have high iron content and will turn red after heating, but most of them do not have this condition or will not turn red. So soak the solution of ferric nitrate or the first ferric salt for one month, then soak it in sodium nitrate for about two weeks, then dry it, and then heat it for acidification, and it will turn red. Usually called green agate dyeing method, the original is soaked in chromic acid solution or dichromatic acid solution, dried and then heated. Due to the influence of acidified chromium, agate produces green coloring effect.
Blue agate can be colored in two ways. One is impregnation with cobalt chloride solution and then acidification. The other is to soak agate in red blood salt or yellow blood salt solution, then soak it in the second dose of iron salt solution to change it, and then heat it to get the blue effect.
In the dyeing method of black agate, the original is first soaked in sugar solution, and then boiled with concentrated sulfuric acid to carbonize it, so that its tissue will appear black because of carbon. If it can be completely carbonized and heated, the color will be very stable and will not fade. At this time, the dyed product and natural colored agate can get the same evaluation.
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Agate is produced in many places, and the output varies from region to region. At present, Brazil is the most valuable and rich one, followed by Uruguay, India, Chinese mainland, the United States, South Africa, Nigeria and other places.
Agate was once the exclusive product of royal aristocrats, but because of its large output, improved processing technology and many employees, agate products have been very popular in various markets so far, so Taiwan Province Province is the largest exporter of agate products. However, there are still some high value-added products to be developed, such as two-color agate relief, dzi beads from Tibet and Nepal, striped agate twisted beads and other products, dyed with natural stripes to create fine works of art. As long as you spend more time on design and creation, agate can still become the darling of the treasure market.
[img]:htrwh。 /BBS/attachment/2006 07/agate-07 . jpg[/img]
Agate is a granular crystal, so there is a block next to it, which belongs to chalcedony in mineralogy.
Its hardness is 6.5-7, its specific gravity is not fixed, about 2.6, and its refractive index is 1.539 to 1.544.
Agate has different colors and textures, one is grayish white with relatively uniform color, and the other is very clear lines.
Road. There are other minerals, such as manganese dioxide, black agate, iron and red agate.
Green agate contains chromium, but colored agate is rare, mostly translucent grayish white, but it is mainly used by consumers.
The habit of colored agate is more acceptable, so there will be agate dyeing, which will be discussed later. Let's start with agate
The origin of names has existed since human beings, and they have been unearthed all over the world. Its English name
Known as (agate), the river in Sicily, Italy, where this gem was discovered in ancient times was named (agate), so it was extended.
But for today's English name (agate). Most of these gems found in Chinese mainland are in the shape of horse brains.
So our ancestors named it agate.
Agate has been used as ornaments and utensils to decorate the body since ancient times. It is made of white jade, the necklace of Emperor Wu of Han Dynasty.
The agate stone is the le and the white glass is the saddle. It was also used as the button head of robes in the Qing Dynasty, and it is also used in modern Japan.
Kimono also has agate buttons, and Kesaya, a monk, has them. Agate itself is in good condition and is also used in industry.
In industry, such as the polishing of high-grade pigments, the surface polishing of gold is also scraped with agate stone. Buddhist ornaments-dough twists
Beads, hand beads, tantric dzi beads, especially Muslim twisted beads especially prefer red agate. Agate carvings, pendants and pointers
Our production capacity is great, and we are deeply loved by people from all walks of life.
Agate dyeing, which is a recognized behavior in precious stones, is not good for other precious stones. but
The manual treatment of precious stones needs to pay attention to its permanence and stability, which requires high technology and experience. agate
Dyeing must be inorganic dyes, such as metal acidulant or carbon, plus stabilizers.
/kloc-0 At the beginning of 925, two small towns in West Germany, Ida Oppenstein and Jiafu in Japan, probably made their fortune at the same time.
The dyeing methods of agate with various colors are introduced. Agate is a granular crystal, and there are some tiny gaps in the crystallization space.
This is different from ordinary single fine crystal, so in the crystal gap of agate, it is soaked with metal salt solution.
Its feasibility, the most important thing is to acidify it by heating, or soak it in a second liquid to reverse the internal inorganic dyeing.
Therefore, in short, if the colorant cannot penetrate into the crystal gap, the purpose of dyeing cannot be achieved.
In the dyeing method of red agate, some Mayao rough stones have high iron content and will turn red after heating, but most of them will not.
This situation does not necessarily turn red, and it needs to be soaked in iron dinitrate or salt-iron solution for one month.
Soak in sodium nitrate for about two weeks, then dry it, and then heat and acidify it to turn red.
Usually called green agate dyeing method, the original stone is soaked in chromic acid solution or dichromatic acid solution, and then dried.
Heat treatment, due to the influence of acidified chromium, agate produces green coloring effect.
There are two ways to color blue agate. One way is to soak it in cobalt chloride solution and then acidify it. another
One is to soak agate in red blood salt or yellow blood salt solution, and then soak it in the second dose of iron salt solution, so that,
It changed, and then heated to get the blue effect.
The dyeing method of black agate is to soak the original stone in sugar solution, and then boil it with concentrated sulfuric acid to make it shape.
It is carbonized, so its structure will appear black because of carbon, if it can be completely carbonized and heated.
If it is complete, the color will be stable and will not fade. At this time, artificial dyes and natural colored agate can be used.
To get the same evaluation.
Agate is produced in many places, and the output varies from region to region. At present, the most valuable and abundant are
Brazil, followed by Uruguay, India, Chinese mainland, the United States, South Africa, Libya and other places.
Agate used to be the exclusive product of the royal family, but it has been passed down to this day because of its large output and improved processing technology.
With the increase of agate products, agate products are very popular in various markets, so Taiwan Province Province is the largest exporter of agate products. But there are still
Some high value-added products need to be developed, such as two-color agate relief, Tibetan and Nepalese dzi beads, striped horses and so on.
Nau's twisted beads, and other products, take their natural stripes and dyes to create artistic products. As long as you're building
Paying more attention to design and creation, agate can still be the darling of the gem market.
How to dye agate? Agate dyeing is not fraud. Agate dyeing is allowed by national standards.
Small enterprises are not encouraged to engage in agate dyeing. Some agate colorants are very toxic and will seriously affect the environment.
Is red agate dyed? Agate is not worth faking now, it is basically true.
This is the most common color of agate. No problem. Agate is very cheap now.
Excuse me, is my agate dyed? It's natural color, not color. Well done, very good! .