TY  - SER
AU  - A.SCOTT,David
TI  - Application of colour metallography in the examination of ancient metals
SN  - 0039-3630
KW  - Aguafuerte
KW  - Aiguafort
KW  - Colour etching
KW  - Contrast de fase diferencial d'interferència
KW  - Contraste de fase diferencial de interferencia
KW  - Differential interference phase contrast
KW  - Examen metal·logràfic
KW  - Examen metalográfico
KW  - First-order red plate
KW  - Metales
KW  - Metallographic examination
KW  - Metalls
KW  - Metals
KW  - Nomarski plates
KW  - Placa roja de primer orden
KW  - Placa vermella de primer ordre
KW  - Placas Nomarski
KW  - Plaques Nomarski
N2  - 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
ER  -