Why do pearls turn yellow when they are old? This means that pearls have a lifespan,Pearls and yellowing is a sign of pearl aging. Pearls have always been regarded as treasures. Ancient tombs are often unearthed in ancient tombs all over the country, but ancient pearls have never been valued by collectors. At the beginning,Pearls after the rich women died, especially the ladies and young ladies who died early,Pearls they often buried their favorite pearls together. Like the human beings, the pearls that entered the earth are all young and shiny,Pearls but when they were unearthed, they were yellow and yellow. They lost their former style and are not cherished by others.
Pearls are bred by pearl mussels,Pearls and their luster and pearls have a certain life span. Although the life span is longer than that of human beings, the nacre layer in the exposed air is oxidized and changes from white to yellow. Even if the pearls buried there were well preserved in the coffin,Pearls they would lose their unique luster. The crack of the nacre, if the coffin is not well sealed,Pearls it will usually become a pile of residue. On the little hat of Qianlong, there is a big pearl, which has been passed down from generation to generation by the last emperor Pu Yi. It has gone through more than two hundred years and is still intact to this day,Pearls but in terms of brilliance,Pearls it is already "old man" pearl yellow. Its collection value is mainly reflected in the emperor's royal experience,Pearls which is difficult to preserve forever. According to modern scientific research, pearls are known as calcium carbonate crystals combined with special colloids of shellfish. Each pearl contains more than 90% calcium carbonate and about 4% moisture. The pearl relies on this moisture to make it shine. Pearls that have not been used for a long time are easy to get rid of water,Pearls and they will turn yellow after about six or seventy years or more than one hundred years. This shows that the life of pearls is not long. A pearl has about a hundred years of opportunity to show its brilliance.
