4 thoughts on “Why does gold placed for a long time and will not change color?”
Jerome
Gold will change color for a long time, but the change is slow, and it will not seem to change the color if it is exposed to the air like other metals. There will be color changing phenomena.
In the physical characteristics of gold, the color of the gold is bright yellow, and yellow -green steam is generated when it is melted in high temperature. In the process of smelting gold ore, gold powder is brown. With a strong ductility, as long as there are suitable tools and special methods, you can forge gold very thin and thin, which is also a reason why gold is particularly suitable for manufacturing and processing jewelry. In addition, its forgedness is also very powerful, with extremely high thermal conductivity and conductivity, coupled with the super stability that other common metals do not have, it is not easy to chemically react with other materials (oxidation reactions), and this is also this is also No matter how long gold is placed, it looks like bright yellow. ? Will the gold rust? Before talking about the question of "whether gold will rust", let's talk about the cause of other metals rust. Take iron as an example. The oxygen contact in the air will generate iron oxide. Essence The difference between gold and most common metals is that in normal temperature environment, it is not easy to have a chemical reaction with oxygen, giving people a illusion that it will not rust, but in fact gold will rust, but it will be rusty as other metals. The rust and speed are different. The speed of "rust" in gold is extremely slow, and it must meet certain conditions. Therefore, it does not seem to rust or change color. In fact, it is just that the environment does not meet the "rust conditions". Why do gold change color? There are many reasons for the discoloration of gold. The most common gold on the market is 999 full gold, but more or less will bring some impurities, and these impurities will lead to the color of gold. It has nothing to do with whether the gold itself will change color. The common reasons for gold changes are not as complicated as expected. Taking the environmental environment as an example, when the environment of gold contains hydrogen sulfide acid gases, gold will "rust", and there will be some reactions on the surface. The method of oxidizing the iron oxide is similar, but the speed is not so fast. At this time, gold will show dark gold, orange, brown -red, etc. At this time, these different colors are caused by "rust", but the rusty method and common way The metal rust (oxidation reaction) is different. The conclusion: Many people think that gold does not rust. In fact, it is not wrong to understand. In normal temperature environment, other common metals will contact oxygen, and will gradually appear oxidized. There will be no reaction (in the normal temperature environment, non -pure oxygen environment), but if some special acidic substances encounter, gold will have changes similar to "rust", and the reason why gold is placed for a long time will not change color for a long time. Because it does not respond to the material in the storage environment, and it does not come into contact with substances that can make it discolored, such as mercury, mercury -containing substances (cosmetics), acid substances, etc.
In fact, it will change color after a long storage time. The reason for the discoloration is that when the full gold and thousands of gold products are touched with dust, sulfur, acidic substances, etc. due to the storage environment, climate change, "Rust" or discoloration.
Generally not, the golden chemical properties are stable and are not easy to oxidize.
The possible cause of discoloration:
. When the full gold and thousands of gold products are contacted with dust, sulfur, acidic substances, etc. due to storage environment, climate change, the surface may appear " Long spots "," rust "or discoloration. This is because the surface of the gold jewelry is oxidized.
If gold, if you often wear more exposure to the skin, or have more contacts in daily life, you will oxidize after you get more cosmetics. So it will change color and become not shiny. Will be dim
Because gold is mainly a substance that is not easy to be oxidized, with high density and good brightness. At the same time, he has a certain hardness, so long -term storage will not change color and will not produce pigment spots.
Gold will change color for a long time, but the change is slow, and it will not seem to change the color if it is exposed to the air like other metals. There will be color changing phenomena.
In the physical characteristics of gold, the color of the gold is bright yellow, and yellow -green steam is generated when it is melted in high temperature. In the process of smelting gold ore, gold powder is brown. With a strong ductility, as long as there are suitable tools and special methods, you can forge gold very thin and thin, which is also a reason why gold is particularly suitable for manufacturing and processing jewelry. In addition, its forgedness is also very powerful, with extremely high thermal conductivity and conductivity, coupled with the super stability that other common metals do not have, it is not easy to chemically react with other materials (oxidation reactions), and this is also this is also No matter how long gold is placed, it looks like bright yellow.
? Will the gold rust? Before talking about the question of "whether gold will rust", let's talk about the cause of other metals rust. Take iron as an example. The oxygen contact in the air will generate iron oxide. Essence The difference between gold and most common metals is that in normal temperature environment, it is not easy to have a chemical reaction with oxygen, giving people a illusion that it will not rust, but in fact gold will rust, but it will be rusty as other metals. The rust and speed are different. The speed of "rust" in gold is extremely slow, and it must meet certain conditions. Therefore, it does not seem to rust or change color. In fact, it is just that the environment does not meet the "rust conditions".
Why do gold change color? There are many reasons for the discoloration of gold. The most common gold on the market is 999 full gold, but more or less will bring some impurities, and these impurities will lead to the color of gold. It has nothing to do with whether the gold itself will change color. The common reasons for gold changes are not as complicated as expected. Taking the environmental environment as an example, when the environment of gold contains hydrogen sulfide acid gases, gold will "rust", and there will be some reactions on the surface. The method of oxidizing the iron oxide is similar, but the speed is not so fast. At this time, gold will show dark gold, orange, brown -red, etc. At this time, these different colors are caused by "rust", but the rusty method and common way The metal rust (oxidation reaction) is different.
The conclusion: Many people think that gold does not rust. In fact, it is not wrong to understand. In normal temperature environment, other common metals will contact oxygen, and will gradually appear oxidized. There will be no reaction (in the normal temperature environment, non -pure oxygen environment), but if some special acidic substances encounter, gold will have changes similar to "rust", and the reason why gold is placed for a long time will not change color for a long time. Because it does not respond to the material in the storage environment, and it does not come into contact with substances that can make it discolored, such as mercury, mercury -containing substances (cosmetics), acid substances, etc.
In fact, it will change color after a long storage time. The reason for the discoloration is that when the full gold and thousands of gold products are touched with dust, sulfur, acidic substances, etc. due to the storage environment, climate change, "Rust" or discoloration.
Generally not, the golden chemical properties are stable and are not easy to oxidize.
The possible cause of discoloration:
. When the full gold and thousands of gold products are contacted with dust, sulfur, acidic substances, etc. due to storage environment, climate change, the surface may appear " Long spots "," rust "or discoloration. This is because the surface of the gold jewelry is oxidized.
If gold, if you often wear more exposure to the skin, or have more contacts in daily life, you will oxidize after you get more cosmetics. So it will change color and become not shiny. Will be dim
Because gold is mainly a substance that is not easy to be oxidized, with high density and good brightness. At the same time, he has a certain hardness, so long -term storage will not change color and will not produce pigment spots.