Writing Fluids
The very general use of steel pens has caused a corresponding demand for easy flowing inks, many of which have been of late years introduced under the title of "writing fluids," or "steel This is a cheap and good ink, and resists ordipen ink." These are mostly prepared from nary destructive agents well. It is perfectly galls in the preceding manner, but a less liquid, scarcely thickens by age, deposits no quantity of gum is employed. The blue sediment, and does not corrode steel pens. steel pens. writing fluids, which either maintain their Digest pound logwood in fine chips for 12 color or turn black by exposure, are prepared hours in 3 pints boiling water then simmer from the ferrocyanide of potassium (prussiate down gently to 1 quart, carefully avoiding , carefully avoiding of potassa), or from indigo. dust, grease, and smoke. When cold, decant