Wednesday 30 July 2014

TECHNIQUES OF METAL DECORATION (PART-1)


Development of human civilisation was heavily dependent on discovery of metals. Pre-historic man gradually understood the use of metals and started to use them for various purposes. He started fashioning them into weapons and tools. With the progress of time he discovered metals like copper, bronze, silver & gold. He started using these metals for personal adornment and one after the other advancements were made in the way jewelry was fashioned by him. As a result, beautiful techniques were developed to decorate metal.
This post of The Jewel Affair is an effort to explore the journey of how these techniques evolved over the centuries. Some of the most popular techniques are:
FILIGREE: it can be defined as an ornamental technique where twisted wires of silver and gold are joined together to create an open framework. The word filigree is derived from the Latin word filum meaning thread. Filigree is also known as telkari- Anatolian word meaning wire work.
Filigree is an ancient art which was practised by the Greeks and Etruscans (ancient Italian Civilisation). This art advanced the most in the period from the 6th Century B.C- 3rd Century B.C. In the Medieval times it was practised by the Moors of Spain. Moors were the Medieval Muslim inhabitants who practised this art to perfection and created exquisite designs. Around 600 A.D the Irish craftsmen became renowned for the variety they brought about in the art.
Filigree still exists in India, Mexico and Scandinavian countries. In India the craftsmen till date retain the patterns of the ancients Greeks. These patterns are believed to be passed on from the time the Greeks came to settle down in India. Cuttack in Orissa still showcases traditional filigree work.
Filigree is of two kinds:
Open: in open filigree the wirework is an open framework. There is no metal backing or support.
OPEN FILIGREE

 Closed: in closed filigree the framework is supported by a metal back.
CLOSED FILIGREE

REPOUSSE´ & CHASING: This is technique of freehand hammering which uses specific tools to create relief work. This technique is a combination of two techniques put together.
 Repousse´ is a French word which means to ‘push out’. In this technique the metal is hammered from both front and back to create a sculptural relief. It is believed to be an ancient technique. Armour plates decorated with this technique are found which date back to the 3rd century B.C. Repousse` is of two kinds:
  • Eastern Repousse´
  • Western Repousse´

The difference between these two techniques is basically of the tool shapes and the angle at which the metal is struck. And the most notable difference is of the height and depth created in the relief. Eastern technique was used by ancient Egyptians and Greeks and Western technique moreover used in western Europe, Japan, Thailand and other parts of Asia.
The most famous examples of Eastern Repousse` are the Gold Mask of Tutankhamun and Vaphio cups. The biggest sculpture created with this technique is The Statue of Liberty.
GOLD MASK OF PHARAOH TUTANKHAMUN 

VAPHIO CUPS

 On the other hand, chasing is used only on the front side of the metal to bring finesse to the design. This is usually a slow process and there is no loss of metal. The only disadvantage of this process is that contact of tools with the metal is evident unlike other techniques.
A repousse` artist uses a working surface which is called the chaser’s surface. It is made of pitch which is a viscous polymer derived from coal tar, resin and plaster of Paris. This surface keeps the metal in place while it is hammered.

ENAMELLING: in this technique coloured powdered glass is used create a transparent coat on the metal. Powdered glass is fused on to the metal by application of heat, the glass then melts and flows and is fused to the metal. This is an ancient technique of decorating jewels and artefacts. The earliest remains of enamelled artefacts dates back to 13th century B.C. This technique in modification was used largely by the Egyptians and Romans.
There are various enamelling techniques which are used, but this post deals with four most popular techniques:

CHAMPLEVE´: it is French word meaning ‘raised-field’. This technique blossomed fully in the 12th century and was most popularly practiced in France and Italy. For Champleve` a slightly thicker metal sheet is used and patterns are developed by creating a low relief. Basically, the metal is shaved out a bit to create space for enamel to be filled in. The recessed areas are then filled with powdered enamels and heated so that the enamel melts. Enamel is built up in layers so that it reaches the same height as that of the remaining metal. This technique was used mostly with copper.
CHAMPLEVE´

BASSE-TAILLE: Basse-Taille literally means low cutting or engraving in French. It is
an extension of Champleve´ technique and developed to its best in 13th-14th century. It is slightly different from Champleve`. The basic difference is that the area which is shaved out, in that area a figure or a design is chased out and instead of powdered enamels transparent enamels are used. This technique is used on usually gold or silver. In Basse-Taille the metal shines through the transparent enamel and adds a beautiful glaze to the enamel. All these factors in totality give the enamelled object a three dimensional effect.
BASSE TAILLE

CLOISONNE´: the name of this technique is derived from the French word cloison, which literally means a cell. This art was most popular in the periods between the 6th-12th century in East Roman Empire and Gaul and Britain. In this technique flattened wires are soldered on a metal base. The attached wires result in creation of cells or compartments. These compartments are then filled with powdered enamel. The enamel is then heated and fused with the metal.
CLOISONNE´

PLIQUE-A´-JOUR: in French Plique-A´-Jour means ‘letting in daylight’. This technique is similar to Cloisonné except for the fact that the wirework created does not have any backing or metal attached to it and transparent enamel is suspended in the cells of the wirework and then heated. This is used to create a stained glass effect. Several transparent colored enamels are blended between the wires to give that delicate water color like appearance.
 
PLIQUE-A´-JOUR

Part-2 of this article will talk about some more interesting techniques like Acid Etching, Embossing and Stamping.

*Pictures adopted from Google.

Saturday 19 July 2014

Manufacturing Processes for Jewelry

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Thursday 10 July 2014

Perspective Drawing


The previous post of The Jewel Affair spoke about technical drawings. The two types of technical drawings commonly used are:
  • Orthographic Representation (Article-6)
  • Perspective Drawing

This article is about an introduction to the perspective drawings and its types. These technical drawings are very interesting and intricate at the same time. And is the most important link between the designer and the craftsman. One can use these drawings to provide the smallest of detail for the designed product.
But, how does one define perspective drawings?

Perspective drawing is a technique which is used to represent three dimensional images on a two dimensional plane. There are two main aspects of perspective drawing:
The size of the object seems to diminish according to the distance.
The tone and colors change as you move farther from the object.
One of the most important elements of a perspective drawing is a Horizon Line. This is directly opposite to the viewer’s eye level.

Types of Perspective Drawing:
One Point Perspective: it is named so because it uses only one Vanishing Point (vp) to draw an object. The vanishing point is usually on the horizon line. All parallel lines from the viewer’s angle recede to the horizon towards the vanishing point.

ONE POINT PERSPECTIVE DRAWING


EXAMPLE OF ONE POINT PERSPECTIVE

Two Point Perspective: this type of drawing uses two Vanishing Points (vp1 and vp2) and the lines are parallel to two different angles.

TWO POINT PERSPECTIVE DRAWING


EXAMPLE OF TWO POINT PERSPECTIVE

Three Point Perspective: as the name suggests it has three vanishing Points (vp1, vp2 & vp3). In addition to the two vanishing points the third Vanishing point is added either above or below the perpendicular, as to how the wall will recede in the ground or soar above. So, the vanishing point is considered either above or below the ground.

THREE POINT PERSPECTIVE DRAWING

EXAMPLE OF THREE POINT PERSPECTIVE 

Perspective drawings are used on a large scale by interior designers and architects. Three point perspectives are the most useful for a jewelry designer.


Technical drawings are the most useful tools in the hands of a designer and the most vital aid for a craftsman. It is the most crucial link between the artist and the worker. So, one must practice these drawings until perfection is arrived at.



Construction of perspective drawings is a complex and practical process. It is best understood practically in a class through an expert.


Picture Courtesy: Google Images

Tuesday 8 July 2014

Koh-I-Noor

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