Speculum Small

Speculum Small

Xiuyu eight quality evaluation standard - HC Network Jewelry Industry - Disposable Wound Dressing Pack

Xiuyu is one of China's four famous jade, development and utilization of a long history, produced in Liaoning Xiuyan County, composed mainly of serpentine, usually green, good transparency, hardness, density of 2.5-2.7 to 4.9-5.5 g/cm2, glass, gloss or oil sheen, its output accounting for about 70% of the total output current jade around the country in 2000, Shi Shi candidates selected in the Buzz Index.

Xiuyu quality assessment based primarily on the following eight essential elements and standards.

1. Color Xiuyu variety of colors, different shades, by color class and depth can be divided as follows.

Green Series: dark green, green, green, grass green, light green.

Yellow series: orange, lemon yellow, yellow, light yellow.

Black Series: ink, black, blue, dark gray, gray, light gray.

White series: milk white, mortar, colorless.

Mixing series: green, yellow and green, green, yellow, white and yellow, white and yellow and gray.

Flower jade series: red texture, brown texture, texture orange, yellow texture.

In various colors, the green line the best, followed by yellow.

Good and specific evaluation of the color difference should be observed and analyzed from four aspects, namely, concentration, purity, brightness and uniformity. Concentration refers to the depth of color, generally speaking, a moderate concentration of the best, too poor or too light. Purity refers to the degree of pure tone, when mixed with other colors, the not pure, and or called color cast, and obviously, the more pure tone better, less time mixing. Brightness is the brightest color, also known as color Yang, of course, the bright degree the higher the better. Uniformity is the uniformity of color distribution, generally speaking, the better the color more uniform, uneven is bad, but variety is not the case for some cave jade, jade flower, all kinds of red, brown, orange and yellow and change many-fold pattern, often constitute a peculiar and beautiful picture, but even more precious.

2. Transparency Transparency in terms of its importance for the five more prominent, because the vast majority of single crystal stones are transparent, not very different, and Wang Shi is not, brightness vary widely, mostly opaque, transparent or translucent micro- , a small number of transparent or sub-transparent, so transparent the more valuable good. Xiuyan a prominent feature of serpentine jade is generally transparent, not only in other parts of the serpentine than the king of transparency, and transparency than any other variety of jade and higher. From the market statistics to see a variety of cave jade carvings, most of Asia and transparent or translucent, small and micro-transparency for the transparency, opaque rarely. Xiuyu is known as one of China's four famous king, we should say good transparency played a key role.

3. Texture The finer the stone, the better, the more uniform the better. Jade is a polycrystalline aggregates, the particle size determines the crystal quality of the delicate and rough jade the extent that the smaller the crystal grain size is more delicate jade, crystal grain size is larger the more rough jade. Generally observed with the naked eye, if obvious grainy, then the jade thick, without the grainy, then the jade more subtle, such as under the magnifying glass in 1Q times and no grainy, then the jade is very delicate a.

General, Xiuyu majority is more delicate texture, and a few slightly rough.

Texture and transparency, and polishing of a direct relationship, that the more delicate texture, the greater the transparency the better polished, reflective surface, the more stronger, increase the Xiuyu beauty, improve the quality of Xiu Wang. On the contrary, the more coarse texture, transparency worse, polishing the worse, reducing the cave jade quality.

4. Clarity Clarity refers to the gem's internal cleanliness, that is, the amount of impurities and defects.

Xiuyu because transparency is better, naked eye to see the internal impurities and defects, easy to judge the purity of the good or bad. Xiuyu impurities usually have the following number:

1) white floc impurities. Is the most abundant Xiuyu impurities, such as when the form was patchy, often referred to as "brain", as were scattered like floating when amorphous, referred to as "cotton" or "lock." The results show that the white of the "brain" or "cotton" is the second phase of re-crystallization of coarse-grained serpentine composition.

2) white rice like impurities. Is also common to a Xiuyu impurities grainy Star dot distribution, because much like a small white grain of rice, so the locals called "millet gruel." The results show that these white granular substance was that of early residual carbonate mineral dolomite composition.

3) black impurities. Xiuyu also common to some spotty, patchy, or irregular shape of the black strip impurities, opaque, the locals called "dirty black" is the impact on the quality jade ring the most unfavorable factor. The results show that the black impurities are mainly formed by the graphite.

4) yellow impurities. Xiuyu occasionally can be seen in spots or plaque of some yellow impurities, opaque, light metal was translated. The results show that they are made of pyrite or pyrrhotite composition. Jade impurities were generally negative, reducing the quality of jade, but the different impurities, as it has glittering sheen, you can add new luster to Xiuyu, so Xiu jade carvings, especially in bracelet, when people listen to a good name, as "Phyllostachys Jade" because of its rare, often become collector's items.

5. Running color level

Bought from the market's Xiuyu carvings, often found that some carved pieces after a few days, significantly lighter the color, and transparency of the variation, and where "cotton", "brain" and other impurities clear from the fuzzy variable, the local call this phenomenon as "run color." Obviously, this phenomenon reduces the Xiuyu run color quality. Preliminary study, which is caused by water loss due Xiuyu, we all know, mineral water in many forms, structured water, interlayer water, absorbed water, etc.. Xiuyu is composed of serpentine, serpentine is layered silicate mineral water, according to analysis, the structure of water, interlayer water and adsorbed water exist in the structure of water to (OH) root form, involved in lattice structure, differential thermal analysis shows that more than 700 to prolapse. Interlayer water is filled in the structure of interlayer water molecules in January of water to form, heating above 30 that is beginning to drop out, 100 -200 is the peak. Adsorbed water is filled between grains and cracks in the water, at room temperature can drop out. That analysis, Xiuyu at room temperature, drop out of the water should be absorbed water, there may be some interlayer water. Water is a leading Xiuyu brightly colored and transparent

About the Author

We are high quality suppliers, our products such as Disposable Wound Dressing Pack , Disposable Ear Speculum for oversee buyer. To know more, please visits disposable medical suppliers.