Abstract: A lithographic ink has an oil-soluble additive incorporated thereinto, the additive producing beneficial effects, especially with respect to reducing the pH drift of the ink during use. The additive is produced by combining a primary, secondary, tertiary, or quaternary amine with a polybasic organic acid.

Abstract: The present invention relates to a process for preparing transparent iron oxide pigments comprising reacting an iron compound, an ammonia releasing compound and water in a non-aqueous solvent in which both the iron compound and the ammonia-releasing compound have appreciable solubility. The reaction is performed by refluxing this composition. Where a red pigment is desired, a high boiling alcohol may be employed whereby the refluxing is carried out above 200.degree. C. which thus converts the pigment to a red iron oxide pigment during the reflux step. In order to get a metallic finish, aluminum flake pigment may be added to a mixture of the iron compound and solvent prior to addition of the ammonia-releasing salt.

Abstract: The subject invention relates to a process for preparing ferriferrocyanide pigments. The process comprises(a) forming an aqueous reaction mixture comprising(i) a ferrous salt,(ii) a compound selected from the group consisting of sulfuric acid, hydrochloric acid, an inorganic potassium salt, and mixtures thereof, and(iii) an alkali metal ferrocyanide such that the molar ratio of (i) to (ii) to (iii) is about 1:1 to 0.9:1.5 to 1:1;(b) oxidizing the acidic solution by aeration;(c) heating the aerated solution to from 10.degree. C. to 90.degree. C.; and(d) recovering the pigment.

Abstract: According to the present invention there is provided a process for the production of highly halogenated copper phthalocyanine which comprises heating at an elevated temperature a mixture of copper phthalocyanine, sulfuryl chloride, sulfur monochloride, aluminum chloride and cuprous chloride thereby obtaining a green copper phthalocyanine.