A method of manual processing of the Black Pearl
The current aim is to improve on Pearl optimization grade, increasing its economic value. Jewelry tools for aquaculture beads, pearls are generally no need to change the color of the color , only black pearl production because less expensive, so it will be changed to a dark colored pearls , methods are:
1 staining ( additive ) method. The ammonia solution and then soaked in the sun or put pearls hydrogen sulfide gas reduction , so that the color of black pearls . This produces a brown-black , green, black and black shades of the same color and natural pearls are very similar, and the Department
After the treatment the color of light and heat stability.
2 color ray irradiation method . Up to radiation treatment pearl color is processed into black , natural black pearl similar. The method is the pearl in the diamond source irradiation from black , the color of light and heat stable, this treatment of the Black Pearl so minimal dose due to human shadowless
Rang . Jewelry Tools
Recent variegated colored pearls subtractive treated as a uniform white pearls , the most common method is still the most commonly used artificial bleaching , but the ratio in the operation and continuous improvement , and each trick , the key step is generally not rumor . Japan is rich in pearls, pearl bleach reportedly Japan
There ’s a wonderful place, Guangdong Leizhou quicksand Township Cultured Pearl industry spared no expense to buy a Japanese patent , big pick up around the property owners to learn quicksand visit .
Second, the difference between natural black pearl and black pearl naked in the manual processing
1 color distribution . Black Pearl color uniform staining , and cracks in the drilling and gathering places deep black . Jewelry tool surface color is pure black , while the non- natural black pearl black, but there is a slight rainbow -like flash of blue black , or black with shades of bronze
.
2 . Powder method . Dyed black pearl powder which is black and black pearl powder which is white. But take pearl powder is a destructive test , the operation to be very careful , especially not at any moment to take in the absence of drilling of the Black Pearl .
3 particle size of France . Black pearls are mostly Pinctada maxima , large multi- yield nuclear fertility large beads , seldom less than 9 mm diameter , so less than 8 mm round black pearl , mostly irradiated products. Jewelry Tools
4 iridescence . After radioactive radiation change color black pearl iridescence gaudy color spectrum , accompanied by a strong metallic luster.
5 acid method. In some cases , these can also be used cotton balls dipped in dilute nitric acid ( 2% ) in the Pearl inconspicuous places try rubbing , dyed black pearls make tampons black. This method is a destructive method , it should be less preferred.
However, there is often experienced appraisers can find flaws in the colored pearls. Effective method or instrument test method , such as: infrared spectroscopy , microscopy . Jewelry Tools