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PREFATORY NOTE TO THE THIRD EDITION.

ADVANTAGE has been taken of the demand for a Third Edition of this book to add to it in several places, with a view of bringing the subject-matter up to date; otherwise, no material alterations have been made, compared with the Second Edition, it being evident that the plan on which the book has been written is one which, has met with favour from its readers and critics. The author's best thanks are due to many friends who have been good enough to give him many hints and much valuable information that has been incorporated in this new edition.

GEORGE H. HURST.

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PREFACE.

In offering the following pages to Practical Workers and others interested in the wide subject of “Painters' Colours, Oils, and Varnishes," my aim throughout has been to combine theory and practice, and to show the scientific principles that underlie the methods in constant use. Naturally—and one may say unavoidably—there has grown up in the course of years, in connection with Colour-making, as with every other industry, a good deal of what is known as Rule of thumb" procedure. The amount of this that prevails, however, has been greatly overrated, and we are not far distant from the day when “Rule of thumb" will be generally supplemented among us by an intelligent appreciation of the scientific principles involved. To give the rationale of every technical process is, nevertheless, by no means an easy task, and all that I can hope to have effected is the placing before the reader such a description of the various processes and their underlying principles, as shall be really helpful in practical work.

The information given as to the properties and preparation of Pigments, is either based on my own experience, or drawn from the most trustworthy sources. For a revision of the chapter on Varnishes, and many excellent suggestions, I am indebted to a personal friend, practically engaged in their

manufacture. My best thanks are due to him, and also to Messrs. Brinjes & Goodwin, Follows & Bate, Ritchie & Co., Rose, Downs & Thompson, and Rushton, Irving & Co., who have kindly furnished for the work illustrations of the newest types of Paint and Oil Machinery.

GEORGE H. HURST.

CHEMICAL LABORATORY,
22 BLACKFRIARS STREET,

MANCHESTER, October, 1892.

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