gives back the body or goodness that the hot water and chemical has extracted. Often the virtue is extracted by damp, through the book being left in some damp situation, or by imperfect sizing the paper has first received; in such cases, although the book may not require washing, sizing will be of benefit.
Requisites.—The necessary articles required for washing, etc., are dishes. Those of porcelain are perhaps the best; they may be bought at any photographic material dealers. If much work is done, it is advantageous to have a set or sets of two or three sizes. In using the various dishes, ample room should be given to allow the hands to enter the water and pick up the sheets or leaves without any danger of tearing. Should the pans be of such a size as to be too heavy to move when full of water, they may be emptied by means of a syphon, the short end of the syphon placed, in preference, at one of the corners of the dish, so as not to touch the sheets. The dishes may also be made of wood, lined with zinc or lead: for very large work these must be used, the porcelain are not made above a certain size.
A kettle for boiling water in.
A gas-stove, or substitute, for heating purposes.
A peel, made of wood, to hang the sheets on the lines. The sheets are placed on the peel, from which they are transferred to the lines.
Chloride of lime for solution of chloride of lime.—Make a saturated solution of chloride of lime by mixing intimately the lime with water in a large jar. When clear the solution may be used. To every gallon of hot water take from this stock solution two or three ounces.
Note.—Chlorine bleaches all vegetable matter.
Hydrochloric acid, also known as muriatic acid or spirits of salts (poison)
Oxalic acid (poison).
Powdered alum.
