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Niello is a deep black metal mixture that is fused onto metal for decorative effect. Though worked on three-dimensional objects, the effect might be considered graphic because it relies primarily on shape and pattern. The contrast of the lustrous black inlay against either matte or polished metal is striking and has earned niello a special place in the arsenal of decorative techniques.... (2001) Complete Story
The principle of this ancient, valued procedure is described here because of its historical interest, and with the thought that young people coming into the field should be aware of the basic procedures of the trade, even though they may not pursue them. In the case of precious metal refining, it is generally more efficient to send scrap to a reputable refiner where sophisticated equipment and years of experience will insure accuracy. In addition, the procedures described below use dangerous acids that mandate industrial quality ventilation and safety precautions, which makes the decision to send out refining chores even more compelling.... (2001) Complete Story
Though sand casting has been largely replaced by centrifugal casting in recent decades, for hundreds of years it was the most popular of all casting methods. It still plays an important role in the production of large metal forms, and can offer the advantages of low cost, quick results and ease of duplication to those goldsmiths who take the time to master it. Though sometimes thought of as coarse, sandcasting can yield results that are as fine and true to detail as any other casting method.... (2001) Complete Story
It is not uncommon for moving parts to wear out. This is to be expected because of increased friction as parts rub against one another. A common example can be found in connecting rings such as the jump rings that attach a charm to a bracelet or a pendant to a chain. If a section of the ring is worn thin it is usually best to discard....
(2001) Complete Story
The purpose of precious metal testing is to determine, first, whether a given sample is precious or base, and, second, to determine what proportion of an alloy is precious. Sophisticated equipment is used in a precious metal laboratory to determine content and purity values with great precision, but our attention here is given to methods a working goldsmith can use in the studio to determine metal content to a practical degree of accuracy..... (2001) Complete Story
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