. The book of photography; practical, theoretical and applied. Fig. 910.—Steel Burnisher with Wooden H.^ndle. Fig. 913.—Roulette with Milled Li.\es» before described, but of rather greaterstrength. A red powder known asdragons blood is sometimes used in-stead of asphaltum ; in this case a stifferink is required, known as American etch-ing ink. The powder is brushed on asbefore, and the plate heated till the imageassumes a deep brown colour. In a modi- whirler. It is usual to dust the negativewith French chalk to prevent the bitumensticking to it during printing. Develop-ment is accomplished by
. The book of photography; practical, theoretical and applied. Fig. 910.—Steel Burnisher with Wooden H.^ndle. Fig. 913.—Roulette with Milled Li.\es» before described, but of rather greaterstrength. A red powder known asdragons blood is sometimes used in-stead of asphaltum ; in this case a stifferink is required, known as American etch-ing ink. The powder is brushed on asbefore, and the plate heated till the imageassumes a deep brown colour. In a modi- whirler. It is usual to dust the negativewith French chalk to prevent the bitumensticking to it during printing. Develop-ment is accomplished by flowing over withturpentine, aided, if necessary, by gentlerubbing with cotton-wool. When develop-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
