Photo-Aquatint, or the Gum-Bichromate Process, With Illustrations

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. If not altogether new in principle it is so in its applica tion, for the very qualities which caused it to be cast aside at the time of its original inception as worthless, or at least impracticable, are those towar...