tr. = trace
1 Mixtures of vermilion and red lake are common in the works examined. It is not certain whether these represent colourmen’s mixtures or are a part of Seurat’s practice.
2 Lithopone could be present in these samples.
3 Starch, probably added by the manufacturer as an extender or to modify paint handling properties, was detected microscopically, by SEM and FTIR. It is found particularly in zinc yellow containing paint, which has discoloured in a number of cases.
4 Emerald green is copper acetoarsenite; vert Véronèse in the contemporary French colour lists (see note 6 below).
5 The organic yellow is associated with lead white as a substrate or extender.
6 Viridian is transparent (hydrated) chromium (III) oxide; vert émeraude in the contemporary French colour lists.
7 Manganese violet is one or other form of manganese phosphate pigment.
8 Lead white presumed to be the white pigment used; not analysed.
9 Sample contains some silica.
10 Black pigment is present in the surface design.
St Vincent House, 30 Orange Street
London WC2H 7HH
British Library Cataloguing in Publication Data
A catalogue record for this journal is available from the British Library
ISBN 1 85709 997 4
ISSN 0140 7430
Publisher Kate Bell
Project manager Jan Green
Editor Diana Davies
Designer Tim Harvey
Picture research Xenia Corcoran and Kim Klehmet
Production Jane Hyne and Penny Le Tissier
Printed in Italy by Conti Tipocolor
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