Human use of coral dates back to ancient Greek and Roman times. Red corals from the Mediterranean Sea were then known in Japan as "Persian imports" and were introduced to Japan via the Silk Road during the Nara period (710-784 AD). In medieval Europe, corals were heavily used in the decoration of religious ceremonies and in the making of rosaries.
What are the types of corals?
Calcium carbonate (calcium type) coral – the main component is calcium carbonate, with very little organic matter content.
1, red coral: famous production areas are Algeria, Tunisia, Spain coast, Taiwan Keelung and Penghu Islands, Italy and France's Bay of Biscay and other places.
2. White coral: mainly distributed in the South China Sea, the Philippine Sea, the Penghu Lake and the sulfur ball islands. The colors are white, off-white, milky white, porcelain white. It is mainly used for bonsai process or dyeing raw materials.
3, blue coral: light blue, blue, is a relatively rare variety. It is mainly found in the Mediterranean Waters of the Atlantic Ocean, such as the coast of Cameroon.
Organic matter (horny) corals – corals that are almost entirely made up of organic matter, common species are black corals and golden corals.
4. Black coral: produced in the central Red Sea, Australia, the South China Sea. It is a special species of gorgonian coral. Brownish-black, composed of shell keratin, unusually tough, waxy luster. The cross-section has a contracted treewheel-like structure. It can be used as a pipe, knife handle, ornament, ring face, etc. Black corals can be bleached to a golden brown, posing as natural golden yellow corals.
5, golden coral: golden yellow, yellowish brown. The surface has a distinctive papule-like appearance, some with smooth surfaces that can show halos (or brilliance) under strong oblique light.
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