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Advert for "Webster Liquid Concentrated Transparent Water Colours."
Private collection of Rob Oechsle
This advert was published in George B. Ayres, How to Paint Photographs in Water Colors and in Oil - How to Work in Crayon - Make the Chromo-Photograph - Retouch Negatives and Instructions in Ceramic Painting. A Practical Hand-Book Designed for the Use of Students and Photographers, containing Directions for Brush-Work in all kinds of Photo-Portraiture (Fourth Edition), (New York: Daniel Appleton & Company, 1878)