Studies in Color Sensitive Photographic Plates and Methods of Sensitizing by Bathing

Download or read book Studies in Color Sensitive Photographic Plates and Methods of Sensitizing by Bathing written by Francis Marion Walters and published by . This book was released on 1921 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dyes which are used in color sensitizing ordinary (blue sensitive) plates by bathing require different methods for their most successful application. Pinaverdol, pinachrome, orthochrome T, and homocol may be used in water solutions, with or without ammonia, and are very little sensitive to the presence of electrolytes. Pinacyanol may be used in water solution, if the dry plates are first thoroughly washed, but gives greater sensitizing action with more fog and poorer keeping qualities when used with water, alcohol, and ammonia. Dicyanin gives comparatively little sensitizing except when used with water and alcohol and a fairly large per cent of ammonia. Films require the use of alcohol and ammonia to give the best results with pinacyanol. Commercial panchromatic plates have their color sevsitiveness improved by washing in water, without the increase in fog which occurs when they are treated with ammonia.