Calendar: 1860-1861 Page 137

138 applied sciences Manipulations 'fyc -The Collodion-Use of Bromide-Free Nitric Acid in the Bath-Effects of Under and Over-Exposure in the Camera-Excessive and Deficient Development-Fixing Varnishing &c collodion negatives The Collodion and Bath -Iodide of Cadmium as an Iodizer --its Advantages and Defects-Iodide of Potassium-Inju- nous Action of Nitric Acid in the Bath-Effect of Acetate of Soda-of Glycyrrhizine and Organic Bodies in the Collodion -Decomposition of Collodion by keeping Developing Solutions -Use of Sulphate of Iron to restrain excessive intensity-of Acetate of Soda to increase intensity- Mode of Pushing the Development Failures in the Negative Process -Spots Markings Defective Development &c -Specimens of Perfect Negatives photographic printing Preparation of the Sensitive Papers -English and Foreign Papers-Details of the Albumen Process-of the Plain Paper Process-of the Process with Ammonia Nitrate-Use of Organic Matters in varying the Colour-how to Print feeble and tense Negatives Ton the Prints -With Hyposulphite and Gold-with Sel d'Or-with Alkaline Solution of Chloride of Gold after fixing-with Fulminating Gold in Hyposulphite of Soda photographic printing-continued Fading of Photographs -Its Causes explained how to obviate them-Sulphur Toning-Gold Toning-best Mode of Washing and Mounting Prints Printing by Development -With Chloride of Silver and Gallic Acid-Toning with and without Gold Stereoscopic Transparencies -On Collodio-Albumen developed with Pyrogallic Acid taupenot's collodio-albumen process Mode of rendering Collodion limpid and adhesive-Prepa- ration of the Dry Plates-their Development by Gallic Acid- by Pyrogallic Acid-the Apparatus required for Field-work