Coral bead identification
In addition to the broken, cracked, and scratched coral beads, the color is bright and uniform, the gloss is sufficient, and the color is strong. The most important thing is the natural primary color, but the jewelry market is more than the dyed goods. Corals are mainly composed of calcium carbonate, so they are easy to color. However, many dyed corals only stain the epidermis, and the color is unnatural, and the locality is uneven. The naked eye can see the white inside. The most effective method of identification is to use a cotton swab to rub some acetone solution and wipe it in an inconspicuous area.
If the cotton is red or pink, it means that it is dyed, and the original color should not be discolored. Dyed beads may also gradually fade over a period of years. Some dyed goods are dyed blue with low-grade pale corals, posing as precious African blue corals. If they are wiped with acetone solution, they will show a faded blue dye on cotton. Blackened black corals also have black dyes that fall off. The solvent for removing the nail polish also contains acetone, which can also be used as a true and false color tester for corals.
Some other dyed goods are not corals at all, but may be dyed with marble (granular), fish gelatin, calcined bones, glass (bubble), plastic (light weight), plant buds, rubber and gypsum mixture. There are no uneven stripes that are characteristic of natural corals. If a small drop of hydrochloric acid is used in an unobtrusive test, the fake product indicates that it will not bubble as fast as the original.
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