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Manufacturing
and Processing of Jade
There
are a series of processing on jade from raw material to finished products.
After the raw stones are cut, they will then be divided into different
classes (high quality material, bangle material, ring surface material,
face cards material, makeup material) according to the shape of the stone,
color quantum, flaws, and etc. Then individual raw stone would be cut into
pieces and rich color part would be taken out from the stone in accordance
with the position of flaws, direction of the crackle, degree of color,
shape and the axial direction. After cutting, the processor will design
the finished products according to the color and shape of the cut out
parts. The whole approaches are as follows:
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1.
Stone drawing
After
the raw stones are cut, the material selectors will draw the figures on
the perfect portions (e.g. bangles, flower units, egg surfaces, saddle,
etc.) with pen according to the color and shape direction, the position of
the flaws, the direction of the crackles, the color luster and the axial
direction of crystal. The purpose is to avoid the harm to the useful part
when the material is selected.
2.
Stone cutting, rinsing, rough sanding and smooth sanding
Cut
the stones according to the drawing lines with a aluminum saw daubed with
diamond powder, and then reprocess the raw stone to a rough jade.
Repeat
rinsing and sand the rough jade into the similar figure with diamond mill.
After that use an emery mill to sand the jade until it is smooth and fine.
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3.
Polishing
Polish
the jade with the sheepskin supported by emulsion smeared with mixed
polishing liquid.
4.
Plum juice and lime water washing
To
achieve a more wonderful shine and effectiveness, the jade processor will
lets the jade wash through plum juice and then lime water in the
final phase of the processing. The purpose is to remove the lipid and dirt
tainted from the above processing.
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Plum
juice washing: when the jade material is cut on the machine,
oil stain may filter into the interspaces of the jade. Plum juice is a
kind of organic acid and it can get rid of the oil stain.
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Lime
water washing: in the process of polishing, carbide will be created on
the condition of high temperature and lime water with its alkali
nature can remove the carbide.
5.
Wax polishing
The
final process is to polish the jade with bee wax. The function of this step is to fill the
jade's natural surface pores and to improve the glisten degree, shine and aesthetic feeling.
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The
above steps include plum juice washing and wax polishing that are essential
to the products and will not damage the structure of jade. Furthermore,
these steps have been internationally and commercially recognized as a
standard practice. In the jade industry, if the structure of the jade is
not damaged during the whole process then the jade would be regarded as
Type A jade. If you want to know more about the differences among Type A,
B and C jade, please click here. |
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