Abstract

Abstract 1—Tinting strength is not an absolute function of particle. 2—No direct ratio exists between tinting strength and hiding power. 3—The thickness of the film of adsorbed gases on the carbon-black particles determines the tinting characteristics. 4—The volatile matter present and the oil-absorption properties serve as a measure of the relative thickness of such films. 5—The completeness with which these gases are displaced materially affects the tinting strength. 6—Complete displacement is only possible when the inter-facial tension produced by the dispersing medium at the surface of the carbon-black particle is sufficiently low to assure complete wetting.

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