Application of colour metallography in the examination of ancient metals
Application of colour metallography in the examination of ancient metals
- 10 p.
- Mensual
The use of colour in the metallographic examination of ancient metals is useful both for research and teaching purposes. Application of different optical methods of examination include: polarizewd light, with or without a first-order red compensator, and differential interference contrast microscopy (DIC). The use of DIC can be combined with the other techniques mentioned in the text for the examination of etched or unetched metal sufaces, which are best observed microscopically using a metallograph. Colour techinques are now used routinely in industrial metallography, and are available for a variety of metals and alloys. Colour tint etching can be used to enhance grain structure or different phases present in the metallic artefact which may not be visible in conventional etched samples, or which lack optical contrast. Many more applications of these techniques in the examination of ancient metals will be published in the literature as they become better known and second-hand equipment with DIC lenses enter the market at a price suitable for conservation laboratories to purchase them.
0039-3630
Aguafuerte
Aiguafort
Colour etching
Contrast de fase diferencial d'interferència
Contraste de fase diferencial de interferencia
Differential interference phase contrast
Examen metal·logràfic
Examen metalográfico
First-order red plate
Metales
Metallographic examination
Metalls
Metals
Nomarski plates
Placa roja de primer orden
Placa vermella de primer ordre
Placas Nomarski
Plaques Nomarski
The use of colour in the metallographic examination of ancient metals is useful both for research and teaching purposes. Application of different optical methods of examination include: polarizewd light, with or without a first-order red compensator, and differential interference contrast microscopy (DIC). The use of DIC can be combined with the other techniques mentioned in the text for the examination of etched or unetched metal sufaces, which are best observed microscopically using a metallograph. Colour techinques are now used routinely in industrial metallography, and are available for a variety of metals and alloys. Colour tint etching can be used to enhance grain structure or different phases present in the metallic artefact which may not be visible in conventional etched samples, or which lack optical contrast. Many more applications of these techniques in the examination of ancient metals will be published in the literature as they become better known and second-hand equipment with DIC lenses enter the market at a price suitable for conservation laboratories to purchase them.
0039-3630
Aguafuerte
Aiguafort
Colour etching
Contrast de fase diferencial d'interferència
Contraste de fase diferencial de interferencia
Differential interference phase contrast
Examen metal·logràfic
Examen metalográfico
First-order red plate
Metales
Metallographic examination
Metalls
Metals
Nomarski plates
Placa roja de primer orden
Placa vermella de primer ordre
Placas Nomarski
Plaques Nomarski