SKETCH EFFECTS A term applied to pictures in which a part is photographic, and the remainder hand-work with pencil, crayon, etc. The usual plan is to work up the picture and then to copy and print dupli cates. Sometimes the sketch effects are obtained by using platinotype or bromide paper, and developing only that part of the image desired by brushing on a developer mixed with glycerine. The usual plan is to make a print upon rough bromide paper, and to brush over any parts that are to be reduced with a " hypo "-ferricyanide or other reducer. The work calls for great care, and the print must be frequently rinsed in water and finally washed. It may be found easier to have the print half dry when brushing the reducer round delicate outlines, as the face, for example ; but the methods employed depend upon the worker's skill. When portraits are taken specially for sketch effects a white back ground should be used. Sketch effects needing no pencil work are largely produced on platino type paper owing to the facility with which such prints can be developed in parts with the platinotype developer mixed with glycerine, but bromide prints may, of course, be developed in a similar way. The objection to bromide paper
for direct sketch effects by development is that the image is not faintly visible after printing, as it is upon platinum paper ; but any part of the image may be reduced at a later stage.
The " hypo "-ferricyanide reducer is rather apt to stain, and the following will be found to. be more serviceable :— A. Iodine, resublimed . oz. 55 g.
Potassium iodide . t „ Ito „ Water . • • 4 „ 40o ccs.
B. Potassium cyanide . t oz. t to g.
Water . . 4 „ 40o ccs.
Two-thirds fill a saucer with water, add a few drops of the A solution until the water is of a deep sherry colour, and then add just enough of the B solution to decolorise. Apply this with a tuft of cotton-wool, the work being done near to running water so that the reducer may be washed off quickly ; the reducer leaves the paper white if allowed to act long enough. Reducers cannot be used for platinotype paper.