A Manual of Photo-Engraving by Harry Jenkins

A Manual of Photo-Engraving by Harry Jenkins

By Harry Jenkins

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The sulphide to about five or six parts of water, to which a few drops of may Keep be added. ammonia this solution covered. MERCURY METHOD. Water. Mercuric chloride. Make chloride a saturated solution. is Some ammonium usually added to cause greater satura- tion. In connection with this solution, solutions 3 and 4 given above are used. CLEARING SOLUTION. Place some iodine crystals in a bottle with some crystals of iodide of potassium and add enough water to make a deep red solution. The quantity of iodide need not be as great as the quantity of 1.

Production of a photographic negative, as described hereafter, depends upon the fact that certain salts of silver are so acted upon by certain of the component rays of white light as to be The salts which have been found to be thus sensitive are the iodide, bromide and chloride of silver, each producing results somewhat different from the others and being often combined in certain proportions to obtain the qual- changed ities in structure. of all in the resulting negative. above, not all of As intimated the rays which together form making a change white light are effective in these silver salts, and this condition also it is in which renders photography possible, for the compounds can be prepared for use in a room from which the ''actinic" rays (as those which affect the salts are called), are excluded, the plate being afterwards properly exposed to the action of the "actinic" light, and the operation is then completed by the aid of the "non-actinic" illumination.

CHEMICALS. The chemicals required for making the collo- dion negatives and for the etching operations are as follows Alcohol (grain). Alcohol (wood). Ether (sulphuric). Iron sulphate (ferrous). Iron perchloride. Gun cotton. Ammonium iodide. Cadmium iodide. Iodine. Potassium iodide. Potassium bromide. Potassium cyanide (fused) Ammonia Ammonium Eosine. bichromate. Strontium chloride. Potassium permanganate. Silver nitrate. Turpentine. Castor (strong). oil. Ammonium Le Page's sulphide. liquid glue.

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