Arhivă pentru categoria Metale

Marcajul “18kgp”.

Posted in Metale cu etichete , , , on 16 septembrie 2011 by expertdiamant

Marcajul “18kgp”.

După search-uri multiple “Ce înseamnă 18kgp.”

gp = gold plated / placat cu aur

18k = puritatea aurului folosit în operaţiunea de placare (poate fi şi 14k, 22k, 24k, etc).

Marcaj folosit pentru podoabe din metal comun / ordinar, acoperite cu un strat EXTREM DE SUBŢIRE de aur, de ordinul miligramelor per obiect.

Vezi şi art. “Marcaje pe bijuterii aurite” din blog, cu descriere mai amplă.

 

Aur nordic / Nordic gold / Nordiskt guld

Posted in Metale cu etichete , , , , on 2 iulie 2011 by expertdiamant

Aur nordic / Nordic gold / Nordiskt guld

Aliajul din care sunt executate monedele euro de 50, 20, şi 10 cenţi.

Utilizat şi în producerea monedelor din alte ţări, precum 10 krona suedeză.

Compoziţie: 89/100 Cu, 5/100 Al, 5/100 Zn, 1/100 Sn.

Aur 986 / 1000.

Posted in Metale cu etichete , , on 4 iunie 2011 by expertdiamant

Aur 986 / 1000.

Sau 986/1000, sau 23 2/3 carate.

Standardul de puritate a ducaţilor (cei mai cunoscuţi vouă, piesele ,,1915″ ).

Ce înseamnă titlul metalului pretios?

Posted in Metale cu etichete , , , , , on 2 iunie 2011 by expertdiamant

Ce înseamnă titlul metalului pretios?

Aliaj de aur, argint, platină

TITLU = conţinutul de metal fin în aliaj, exprimat în miimi su carate.

Exemplu:

585 (sau 583) = 585/1000 aur fin, 415/1000 alte metale ce compun aliajul, ex. cupru, argint, zinc, ş.a. Corespunde la 14 k.

14 k = 14/24 părţi aur fin, 10/24 alte metale. Corespunde la 585 (sau 583)/1000

Tehnica niello.

Posted in Metale cu etichete , , , , on 21 aprilie 2011 by expertdiamant

Tehnica niello.

Următorul articol este extras din Harold Newman, “An Illustrated Dictionary of Jewelry”, sub titlul ,,Niello”. Cei interesaţi vor traduce şi singuri.

An inlay used in decorating in black on silver (infrequently on gold) that is somewhat related to champleve work except that the effect is metallic rather than vitreous.

The process involved engraving (or, for large areas, using other indenting processes) the design into a metal plate, then filling the indented portions with a powdered black matt alloy made of metallic sulphides (sulphur with silver, copper, and lead) according to various formulae, together with a flux, after which the piece was heated until the alloy melted (at 1200 C) and became fused in the grooves and depressions of the design; the piece, when cooled, was scraped and polished until the niello was removed except in the then contrasting design.

Niello decoration is found on Bronze Age non-jewelry articles (usually of gold) and was reintroduced in Roman jewelry in the 4th century AD, and was also used in Egyptian and early Byzantine jewelry, as well as Anglo-Saxon jewelry; however, the method for executing such work was different, in that the inlay was of silver sulphide alone, and it was not melted but merely heated until plastic, then inlayed and burnished.

In the 11th century the niello formulae were developed, and it was used in Gothic jewelry and some pieces made during Renaissance.

Niello has been used also in India and Islamic countries, and also in Russia (Tula work). An imitative process was used in the Balkans by inlaying lead alone, and also by Dutch engravers during the late 16th and mid-17th centuries by applying niello as a background.

It was revived in the 19th century by Karl Wagner;and it was used in France by Emille Froment-Meurice and in London by S.H. and D. Gass.

In recent years it has been simulated by painting on the surface with a niello preparation as a background or a design.  Some niello work is being done today in the Far East.

Aur verde.

Posted in Metale cu etichete , on 17 aprilie 2011 by expertdiamant

Aur verde.

Un aliaj de aur, de 14 sau 18 k, compus din procente variabile de argint (25%-40%), zinc sau cadmiu, având culoare verzuie, în general disponibil în 3 nuanţe.

Cobalt

Posted in Metale cu etichete , on 13 martie 2011 by expertdiamant

Cobalt

Simbol, Co, element metalic, număr atomic 27.

Descoperit în 1735 de G. Brandt.

Densitate 8,83 g/cm3.

Punct de topire 1492 grade Celsius.

Aluminiu

Posted in Metale cu etichete , , on 13 martie 2011 by expertdiamant

Aluminiu

Simbol, Al, element metalic, număr atomic 13.

Obţinut de H. C. Oersted în 1825, şi de F. Wohler în 1827.

Densitate-la 20 grade Celsius-2,7 g./cm.3

Punct de topire 658 grade Celsius.

Unităţi de măsurare a greutăţii-India

Posted in Metale cu etichete , on 12 martie 2011 by expertdiamant

Unităţi tradiţionale de măsurare a greutăţii, folosite de către bijutieri în nordul Indiei:

1 ratti =8 jau =8 khaskkhas =1,75 grains troy = 0,122 grame

1 masha = 8 rattis = 15 grains troy = 0,976 grame

1 tanka = 4 mashas = 32 rattis = 60 grains troy = 3,904 grame

1 tola = 12 mashas = 96 rattis = 180 grains troy = 11,712 grame = 1 rupie de argint

5 tolas = 1 chhatak

16 chhataks = 1 ser

40 sers = 1 maund

Bijuteriile Indiei: 1-Dicţionar

Posted in Metale cu etichete on 12 martie 2011 by expertdiamant

Română/Engleză/Hindi/Bengali/Tamil

Aur-gold-sona-sona-pon, sau tangam

Argint-silver-chandi-rupo, sau chandi-velli

Cupru-copper-tamba-tama-tambiram, sau sembu

Alamă-brass-pital-pitol-pittalai

Bronz-bronze-kansa-kansa-vengalam

Cositor-tin-kalai-ranga-takaram

Plumb-lead-sisa-sis-iyam

Zinc-zinc-jasta-dasta-tuttangam

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