Guy,
I referred to two books; sorry I should have been more precise.
Th.H. Hendley: Damascening on Steel or Iron, as Practised in India.
Georg Watt: Indian Art at Delhi 1903.
Here are a few explanations of how some the different decorations were made, and at the end you will find a picture. With a little bit of luck, you will be able to see the hatched area.
Bidri.
Bidri is an ancient way of decorating metal and other materials. Originally gold and/or silver were inlaid in copper or steel. The technique is said to have come to India from Persia around the 15th century, and was/is especially practiced around Bidar (Deccan), where the technique was refined.
The object was caste in moulds of red clay, with a mixture of wax and resin covering the mould. The alloy used is zinc, copper and lead. Then the object is roughly polished and the design drawn. The design is cut out with a chisel and the grove is cleaned with e.g. limejuice, but it is not polished as the roughen surface will help to hold the silver wire. The wire is hammered down in the cut out design. A combination of chemicals from common salt, saltpetre, copper sulphate and Sal ammoniac is applied, after which the metal turns jet-black. Another source mentions: The Bidri design is dipped in a boiled solution of natural earth found only at the Bidar Fort. A final polishing with sandpaper, charcoal and coconut and the shining silver is in sharp contrast to alloy.
Damascening.
A grove is cut in the metal and a gold or silver thread is hammered into the grove. The grove is two third of the thread. The bottom and the sides of the grove are left rough to make the thread stick better.
Nearly all men engaged in damascening in the Punjab are Mohamedans. In the Rajputana, in addition, Hindo workmen are employed.
In Sirohi true damascening is made at its best (Hendley: Damascene).
Gilding.
When gilding, the part of the weapon to be decorated is finely cut cross or crosshatched with a graver, and treated with acid to give it a broken surface. The very thin gold or silver leave is rolled on, and the decoration heated and burnished.
When a very thin gold or silver plate carefully is hammered onto another material, especially iron/steel it will make a molecular connection with the other material.
Another way to do it is to do it electrolytic.
Koftgari (false Damascening).
Koftgari or false Damascening is made by crosshatching the area to be decorated deeper that by gilding, the crosshatching is then cleaned with lime, and silver or gold thread is hammered on to the hatched area in the design wanted. The blade is heated and the decoration is either left to stand in relief or filed down to the surface. The decoration is then polished, often with an agate.
Niello.
Niello is said to have come from Egypt, where it was used for decoration in the classical times, from where it spread to Europe in the middle Ages. It was known in Kiev in the tenth to thirteenth centuries and reappeared in Russia in the sixteenth and seventeenth centuries, where it remained in use in the imperial period.
Niello (latin. Nigellus=blackish) is a black metallic alloy of sulfur, copper, silver and usually lead. The metal surface is brushed with a borax solution as a flux, and the alloy is rubbed into the engraved pattern on silver or gold, and then fired. When the object has cooled, and has been polished the surface is shining blank and the Niello black.
Jens
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