What is the yellowing of turquoise?
Yellowing of turquoise color is generally the effect of oxidation on turquoise color. Oxidation changes Fe2+ (ferrous ion) in turquoise into Fe3+ (trivalent iron ion), so turquoise is yellowish brown and yellow. For iron pine, the iron turns into limonite after oxidation, and the iron around the iron wire turns into rust color, which is partially impregnated on the surface of pine, making the iron wire yellow-brown, without affecting the porcelain degree and quality of turquoise.
The reason why turquoise turns yellow
1. Contact with the dyed object and be dyed.
The color of turquoise is very delicate. Because of its special structure, turquoise pores are easy to absorb colored substances such as oil stains and tea stains. If perfume, nail polish, cosmetics and other substances penetrate along the pores of turquoise, the color of turquoise is easily polluted and becomes yellow or black. Therefore, everyone must be almost cautious when playing on the plate to avoid polluting the color of other substances.
2. Not cleaning up the stains in time
As we all know, turquoise will change color and produce patina after being wetted by grease and sweat. However, if dirt such as dust is mixed with sweat, grease, etc. and penetrates into the pores of turquoise in this process, it will turn black and yellow after a long time if it is not cleaned in time. So remember to keep your hands clean and free from stains when playing with turquoise.
3. Turquoise itself has a yellow background
In addition to being dyed and stained, there is another possibility that turquoise itself has a high ferrous ion content, and this yellow background will not appear before playing, but after playing, when the temperature and humidity reach a certain level, the background color will appear. But this does not affect the porcelain quality and quality of turquoise.
What if turquoise turns yellow?
If the turquoise bracelet turns yellow, it can only be re-polished.
Turquoise of different colors changes color differently, some turn blue and some turn green. Different porcelain degrees change color at different speeds. The higher the porcelain degree, the slower the color change. Raw turquoise will definitely change color in the process of playing, and there will be an embarrassing period of uneven color distribution in the process of color change, so you can continue to play. But changing color does not mean getting dirty. Be sure to pay attention to cleanliness when playing. If the disk is dirty, it is difficult to do it unless it is polished twice. Therefore, we must develop good hygiene habits to avoid long-term dryness, high temperature and collision. In addition, there are many kinds of discoloration, and the original ore and optimized discoloration are different. Some people say that glue does not change color, which is wrong. Turquoise itself will turn white and yellow when it loses water, and it will also oxidize and change color when it is glued for a long time.
Turquoise maintenance taboo
1. Avoid pollution and staining.
Turquoise is porous and contains many tiny pores inside, so it is necessary to avoid dirt from entering. Dirt, such as tea leaves, sweat stains, organic solvents, cosmetics, etc. It will change green permanently after entering, and it is difficult to remove, not to mention letting turquoise come into contact with colored liquids, such as ink. Perfume, cosmetics, skin care oil and many jewelry cleaners are not good for turquoise and will change its color. Turquoise cannot touch dark or faded substances, such as rosewood, which will fade and cannot be directly matched with it. Silver ornaments will turn black when worn, and silver beads cannot touch turquoise. In the process of detecting gems, refractive oil should be avoided to measure the refractive index, so as to avoid turquoise being polluted and discolored by refractive oil.
2. Avoid exposure and high temperature.
Turquoise is a water-bearing mineral, and its color is related to the amount of water. Sunlight and high temperature will dehydrate and discolor turquoise, even discolor turquoise. Therefore, turquoise should not be baked with fire or exposed to high temperature. Turquoise should avoid long-term sun exposure, and it is not advisable to wear turquoise jewelry when going to the beach or sunbathing. Long-term exposure may also make turquoise fade and lose moisture.
Step 3 avoid corrosion
Turquoise is corroded and discolored by strong acid, so it should be avoided to be with corrosive substances. It is best to take it off when playing games or soaking in hot springs, because the swimming pool water contains bleaching powder and disinfectant.