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v

THE MANUFACTURE OF
EARTH COLOURS


THE
MANUFACTURE OF
EARTH COLOURS

BY
DR. JOSEF BERSCH

TRANSLATED FROM THE THIRD GERMAN EDITION (AS
REVISED BY PROF. DR. WILHELM BERSCH)

BY
CHARLES SALTER

WITH THIRTY-ONE ILLUSTRATIONS

LONDON
SCOTT, GREENWOOD & SON
8 BROADWAY, LUDGATE, E.C.4
1921

[The sole rights of translation in English remain with Scott, Greenwood & Son.]


Printed in Great Britain by
Richard Clay & Sons, Limited,
PARIS GARDEN, STAMFORD ST., S.E. 1,
AND BUNGAY, SUFFOLK.


PREFACE

Originally issued as a volume of the series onpigments and colouring matters by the present author’sfather, the necessity for a new edition afforded a welcomeopportunity of revising “Earth Colours.” Although,in the nature of things, little progress has been madein this subject itself, there was a good deal to add inconnection with the mechanical appliances for treatingthe colour earths and manufacturing them into pigments.In other respects, too, the work has been carefullygone through and brought up to date, with new andadditional illustrations.

The author desires to express his thanks to thevarious firms who have afforded him assistance in histask by furnishing illustrations and descriptions of newmachinery, together with other information. It is hopedthat this third edition will meet the approval of thoseinterested in the subject; and the author will be glad toreceive supplementary information to render the workmore complete in the event of a future edition beingfound advisable.

Prof. Dr. Wilhelm Bersch.

1918.


vii

CONTENTS

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CHAPTER I