000			02187nab a2200361Ia 4500
001			Art-34
008			170220s2014 CNT 000 0 und d
020			_a0039-3630
245	1	0	_aApplication of colour metallography in the examination of ancient metals
300			_a10 p.
310	1	0	_aMensual
520	3		_aThe 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.
650			_aAguafuerte
650			_aAiguafort
650			_aColour etching
650			_aContrast de fase diferencial d'interferència
650			_aContraste de fase diferencial de interferencia
650			_aDifferential interference phase contrast
650			_aExamen metal·logràfic
650			_aExamen metalográfico
650			_aFirst-order red plate
650			_aMetales
650			_aMetallographic examination
650			_aMetalls
650			_aMetals
650			_aNomarski plates
650			_aPlaca roja de primer orden
650			_aPlaca vermella de primer ordre
650			_aPlacas Nomarski
650			_aPlaques Nomarski
700	1		_aA. SCOTT, David
773			_tStudies in Conservation 3 _x0039-3630 _g59 2, 113-122
999			_c7725 _d7725