22nd
Silver adorns the great summary of knowledge (two)
Discernment of the silver ornament. Mainly have the following several points.
1)Seal. Silver ornament generally should type English abbreviation to pay the silver ‘ ” S” Or ” Sterling ” )Seal. The seal of the standard silver is S925. The seal of the pure silver is S990. But a lot of countries do not print writing on the silver ornament.
2)Color and luster. Silver ornament present more microstrip yellow silvery white, the soft metallic luster. Because is apt to oxidize, it is long, the color and luster will become dark and yellowish-white.
3)It is heavy to weigh in the hand. The density of the silver is 10.53 grams / c.c.. It is smaller than the platinum, gold, weigh in the hand and has not weighed down feeling with hands. The steel needle can mark the trace, can roll over curved too. Or imitate the silver ornament of Germany of the silver to distinguish with the platinum main fact, K platinum by this kind of method.
4)The acid is tried. Silver will change color to any meet sour, even dissolve. If a drop of dense hydrochloric acid in the inboard of the silver ornament is dripped, the chlorine silver that will produce the white liver moss form immediately is precipitated. Other noble metals do not have this phenomenon.
5)Sound. The sound is oppressive after the standard silver ornament falls, do not bounce, does not roll
Silver knowledge and its quality discrimination
The silver has white gloss, easy to oxidize, apply to ornament and ornament extensively. The reflection rate to the visible light of silver is 91%, and platinum is 69%, palladium is 57%, the high reflecting rate reveals high lightly, so the white gloss of the silver is very noticeable.
(1) Silver ornament classification
The classification of the silver ornament is numerous, classified and mainly divided into the ornament of pure silver and silver alloy jewellery according to the composition:
1.Ornament of pure silver. The surface is bright and clean, silvery white, malleability is good that prolong, seem graceful, generous.
2.Silver alloy jewellery. The surface of silver alloy jewellery is bright, malleability is moderate, process the convenient characteristic that there are silvery white, hardness and prolong, and seem exquisite, exquisite, ornamental and strong. The silver alloy that the ornaments use is mainly the alloy of silver copper, the usually silver content is 92. 5%, have, include silver low ornament too in addition, some with national style ornament, very beautiful, exquisite. 900 alloy is called monetary silver, the ornaments use 800 or their the above alloy. The advantage of the alloy of silver copper is harder than silver; Heat treatment can improve hardness, melting point reduce, can person who cast improve, resist, change color ability raise, it makes the silverware change color that it is apt to produce sulphides. In order to solve this problem, people have studied, find the alloy cost of silver palladium is the lowest. In addition, a lot of ornament still electroplate technology introduce silver ornaments process producer in recent years, plate rhodium to wait for on the surface of ornaments metal in order to the wear-resisting, corrosion-resistant ability to improve ornamently.
(2) Main imitation of the silver ornaments
1.Silver-plated ornaments
The body of fetus of the silver-plated ornament is a kind of alloy material taking copper as main metal, often add metal such as zinc and nickel, the surface is silver-plated by improving the gloss, the advantage of this kind of material resists corrosivity better than the copper product and craft properties are similar to carats again.
2.Bao Yin
Yin Bao use machinery or other method silver parcel surface of metal products.
3.” sandwich “ Silver ornaments
” sandwich “ The silver ornaments are imitations of a new kind of silver ornaments that this monitoring center measured in July of 2002, had not seen the relevant report in the past. This kind of imitation top layer is silver, and the inside is the harmful element ” cadmium ” The sandwich,cadmium element is greatest characteristic that there is heavy potential safety hazard very, it will cause people’s nervous system wounded for ever
(3) Test of the silver ornaments
1.Identification
The ornament seal should include producer’s code name, noble metal material name and content.
2.Watch quality
It is mainly the whole model, processing concrete craft quality such as quality of the ornament
3.Ornament weight
Silver ornaments to come accounting price according to weight and processing charges sometimes, the weight of the ornaments is one of the important indexes, depending on the measurement unit of the ornaments weight of the standard regulation is gram, difference of permitting of each one of the silver ornaments is - 0. 05~0. 04g.
4.Silver content
The silver content in the ornament is its quality’s important index. There are many kinds of methods of inspection of the silver content, can be divided into a chemical analytical method and instrument analytical method. According to the detection procedure whether the ornament is destroyed, can be divided into and can’t harm the law of measuring and diminished the law of measuring, the day-to-day test in the ornament quality superintendent office generally relies mainly on can’t harm the law of measuringing, density law combines large-scale instruments analysis such as X fluorogenic spectrum law,fashionlife electronic probe,etc..
(4) Physical property of the silver
Gloss: Silvery white
Density: 10.5g/ cm3
Hardness: Rub hardness 2. 7
Reflecting rate: The reflecting rate can be up to 91%
Relevant purely silver ornaments
Purely silver ornaments
Pure silver —-Second only to one of the gold valuable metal at present, although the price is not high, but far exceed metal such as the tin, lead in price, but pure silver is too soft and easy to be out of shape, so will usually add other alloy and increase the hardness, the alloy that various countries add is all different, the content that so international standard is silver purely so long as over 925¡ë are regarded as pure silver.
What is meant by 925 silver
The silver decorations purely that are generally selling on the market are all 925 silver, but not 999 pure silver, because 925 silver adds alloy that other metal become silver, such 925 silver is become and admitted for pure silver too in the world, its alloy whose proportion is 7.5% and 92.5% of the silver, the ornaments that such a pure silver forges out are worn and torn and out of shape more firmly and more difficult, real 999 pure silver is as very soft like pure gold, the ornaments that the pure silver which has added the alloy is worked out will be given consideration to durably, unlikely to wear in a couple of days to be out of shape and the surface will wear and tear too terrible polishing needing to be constant.
How to maintain the silver ornaments purely
It is the oxygen in the air to cause the biggest reason that the silverware will be oxidized, so it is the best maintenance way to separate the air, for example put the silver decorations in the sealed plastic bag and put into jewel case, separate the contact of the air and silverware,
Can with wash silver water or wipe silver cloth come, polish silver decorations, wash silver lethality of ink relatively strong when silver is oxidized, so not getting, there is no alternative please try hard to polish by wiping the silver cloth, pick up and wash by water and rub gently with the hands at once after washing bright such as using washing silver, and superficial chemical material clear and clean, dry up with hair-dryer otherwise oxygen of water can accelerate silverware oxidize oh!
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