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Fine Writing Fluid

Dissolve ceruleo-sulphate of potassa or ammonia (soluble indigo) in hot water, and when cold decant the clear. It is an intense blue, and dries nearly black; is perfectly incorrosive, and very permanent and easy flowing. It may be thickened with gum water, or diluted with pure rain water, as required. 2488. Reade's Patent Blue Writing Fluid. Prepare a solution of iodide of iron, from iodine, iron, and water; add to the soluthe written lines with a kind of varnish that will protect the gold from the action of acids or alkalies.