subject: Pearl harvesting, processing and preservation techniques - HC Network Jewelry Industry [print this page] Pearl harvesting, processing and preservation techniques - HC Network Jewelry Industry
Harvest time Early the following year, usually in the years before the arrival, that is November to February the following year. High season is generally not receive beads, because the high temperatures during the deposition nacre fast, loose texture, pearl white surface is often covered by a layer of material (crystalline aragonite dissolved), shiny dark, poor quality. In winter or low temperature conditions, the secretion of nacre pearl slow down, the surface nacre more detailed, smooth, glossy good, so is the best time to harvest pearls.
(2) income bead method Collected to ensure the quality of pearls, beads in the collection, should sampling nacre thickness, in accordance with international jewelry convention, the harvest of all kinds of pearl products, the bead thickness of the following criteria:
Small beads: bead diameter of 2.6 to 4.9 mm, slice thickness 0.3 mm beads;
Beads: bead diameter 5.0 ~ 6.4 mm, slice thickness 0.5 mm beads;
Of beads: bead diameter of 6.5 ~ 7.9 mm, slice thickness 0.8 mm beads;
Large bead: bead diameter 8.0 mm or more thickness of 1.0 mm beads;
After sampling, if the development of bead layer is too thin, not meet commercial standards required period may be extended pearl.
Bead collection method is by inserting after the order for nuclear workers, received a longer accept a complete, smooth and so forth. Fetched from the sea after the pearl shell, shell knife used to open from the ventral edge of the openings into the body shell, cut the adductor muscle force, exposing soft part of the tweezers or knife and gently insert the pearl bag, carefully remove the pearl from the bag .
(3) harvest Pearl harvest, generally based on 10,000 pearls and pearl how much the amount that each of Japan's Mie Prefecture in 1974, 10,000 and pearl, pearl harvest the highest of 13 kg, a pearl of China Zhanjiang farms from 1970 to 1978, per 10,000 pearls and pearl harvest, the highest up to 11.15 kg, a minimum of 4.85 kg. Showed that P. fucata pearls in China, has reached or close to production of cultured pearls in the world advanced level of the country.
Processing and preservation Recently harvested pearls, because the surface with water, dirt and other body fluids and, if placed on too long, make the surface of pearl-like calcium carbonate and organic matter glial condensation occurs, pearl qualitative change in the dark, is oxidized and affect the quality of . Therefore, after harvesting should be handled in a timely manner.
(1) General cleaning Received the pearl into the light and water immersion time, and then wash with soap water and dry after water saved. In order to thoroughly wash away the surface on the remaining fixtures mucus, dirt, pearl harvesting by water washing, the available brine 5 to 10 minutes, then mixed with fine salt, pearl (the ratio of 2:1) rubbing, and then mild soap and water several times of water rinsing, and finally polished with a towel or cloth, dry it and save.
(2) Pharmacy washing poor content of 0.15% pearl available 0.2% lauryl alcohol sulfuric acid washing, then wash with water, dry and save.
dull or stain the surface luster of pearls, can be the concentration of 3% hydrogen peroxide wash, then wash with water dried and save.
And medicinal pearl degree after harvest should not use chemical agent treatment, only water and salt water wash dry.
All treated, dried in the air after the pearl of Clean the bag to be loaded, the seal placed in the locker after the save, do not place the humid areas. Comment Large In Small
