Top best answers to the question «Why are pearls bleached»
Bleaching: Bleaching is used after the initial cleaning to lighten up and even out the natural body color of the pearl. Another reason for bleaching is to remove the visible layer of conchiolin around the bead nucleus.
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Well, bleaching is a great way to clean and brighten the pearl surface and it lends a more uniform look to pearls. This becomes important when matching pearls in a strand or bracelet. There are two processes for bleaching depending upon the type of pearl. Japanese saltwater akoya pearls are drilled and then placed in vessels of hydrogen peroxide.
White pearls and those with very light hues are routinely processed or treated by various methods after harvest, especially akoya and freshwater cultured pearls. Bleaching is the most prevalent and is often used in addition to maeshori treatment, an umbrella term for various types of luster enhancements.
Bleaching is used on Pearls to make whiter more vibrant pearl. Many pearls from Japan and the Chinese Akoya pearls are almost always bleached. The bleached used is usually a hydrogen peroxide solution which is heated. The pearls are placed in the solution for a long period of time which changes the overall color of the organic pearl.
After the initial cleaning, bleaching is often used to lighten and even out pearl color. The first layer deposited over the surface of a nucleus is conchiolin, a dark, porous protein. Bleaching lightens this layer.
The main reason that pearls turn yellow is when they have been stored away for a long time in a dry environment where there is no moisture and circulation of air. This causes the organic substance to dry out and become brittle and yellow. Some people worry that if their pearls are turning yellow, this means that they are fake.
Pearls that grow with a natural white color include akoya pearls, freshwater pearls, South Sea pearls, and even occasional Tahitian pearls, which are most often dark. While white is a naturally occurring color in freshwater and akoya pearls, these types are routinely bleached to create an even whiter bodycolor, and then subjected to a treatment ...
These iconic fashion accessories usually turn yellow as time passes because they dry out. If there is no air circulation and moisture where pearls are kept, their organic composition begins to change, which results in that yellowing. Typically, the way pearls are stored can lead to them becoming dried out, which in turn leads to yellowed pearls.
This is why most cultured Pearl Necklaces are made of Akoya pearls… Such high matching standards result in 90 percent of all Akoya pearls harvested to be lightly bleached and tinted after drilling. These color enhancements are intended to be permanent, and should not change over time.
Pearls become yellow over time when they are not properly cared for, have been allowed to dry out, or are frequently worn. This can be the result of brittle nacre, or from a build up of sweat and oil from the skin. However, there are a few things you can do to whiten yellowed pearls and enhance their natural beauty and luster.