The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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Arrowroot                                                Artigue's Process
Arrowroot (Ger., Pjeilwurzelmehl; Fr., and Ital., Arrowroot). The starch obtained from the tubers of Maranta Arundinacea. It is a fine, white, tasteless, odourless powder which has a par-ticular crepitating feel in bulk. It is used for sizing papers.
Artificial Light, Photography by. See Portraiture, also Flash Light and Acetylene. The following list of books and papers on artificial lighting for photographic purposes may be useful; - "Les Lumieres Artificielles en Photographies par H. Fourtier, Paris, 1895, Gauthier-Villars; u Die Verwendung Kunstlichen Lichtquellen zu Porlraitaufnahmen und Copir-zwecken" by G. Mercator, Halle-a-S., 1898, Knapp; "Treatise on Magnesium Flashlight Photography," by R. Slingsby, London, 1890, Marion.
Artigue's Process. A method of carbon printing without transfer, which, like the gum-bichromate process, allows very complete control in development, and the permanency of the results is assured and does not depend upon the fulfilment of any special or occult conditions in development, toning, fixing, etc. Many workers prefer to purchase the " Papier Velours" or special tissue, made under the directions of M. Artigue from his agents {e.g., M. L. Soux, 48, Rue de la Victoire, Paris). Others, how-ever, may wish to themselves prepare a somewhat similar paper. The following method, due in the main to Mr. Duchochois, if carefully carried out, gives results very similar to those ob-tained upon M. Artigue's own paper. In 15 parts of water 5 parts of white and carefully picked gum arabic are dissolved - the round and slightly friable lumps being selected. When the solution is complete, a matter sometimes of days, the mucilage is strained through muslin, and we next add 100 parts of white of egg and a quantity of Indian ink or other finely ground water-colour sufficient to give a coating on paper, which shall be nearly full black or full coloured by reflected light, but not so opaque as altogether to obscure a coin behind the paper when both are held up to the window. Enough liquid ammonia to make the preparation slightly alkaline to test paper is now stirred in, but a minimum of two drops to each fluid ounce may be added in any case. The preparation is now ready for coating the paper which should be done by brushing on a thin and uniform layer with a broad camel's hair brush. (See Gum-Bichromate.) The
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