Prof. Dr. Erhard Brepohl

Cuttlefish casting is a quick and fairly accurate casting method. Its applications are limited only by the thickness and overall...

Though sand casting has been largely replaced by centrifugal casting in recent decades, for hundreds of years it was the...

As important as the gravers are, it is hard to understate the importance of the devices used to secure work...

Many industries have need of specialized engravers, for instance those who make dies, who cut stones and glass, and others...

Niello is a deep black metal mixture that is fused onto metal for decorative effect. Though worked on three-dimensional objects,...

There are many techniques in which contrasting metals are placed side by side. Those that can properly be called inlay...

For more than two thousand years, goldsmiths have fused glass onto their work for color enrichment. Wonderful enameled work can...

In the twentieth century there can be little doubt that electroplating is the best way to develop a gold coating...

It is not uncommon for moving parts to wear out. This is to be expected because of increased friction as...

A ring fits well when it is no longer felt on the finger. If in the course of time the...

The purpose of precious metal testing is to determine, first, whether a given sample is precious or base, and, second,...

The principle of this ancient, valued procedure is described here because of its historical interest, and with the thought that...

The revival of granulation in our century has been accompanied by many wrong ideas and misunderstandings, many stemming from the...

Because titanium behaves somewhat differently than the standard metals in the goldsmith's workshop some special attention to its working is...

The pleasure and challenge of including gems in a jewelry object (beyond the intrinsic beauty of the gem, of course)...

In practice an experienced eye will usually be able to determine by color and luster whether a piece is made...

The terms repousse and chasing are often confused and not without good reason since the two techniques are often worked...

Rolling can be thought of as a local, or isolated, deformation process during which thickness is decreased, length increased, and...

Etching uses chemical corrosion rather than mechanical force to selectively remove metal. Simply put, the idea is to cloak parts...

When precious metal is heated to temperatures approaching its melting point there is a short span during which the outer...

The first requirement of all catches is that they secure neckpieces and bracelets in such a way that they will...

Box catches lend themselves to a wide range of shapes and are frequently used on chains, bracelets and cuff bracelets....