Abstract
Abstract IF ONE part of colloidal carbon pigment is boiled for 15 minutes or more with three to ten parts of distilled water and cooled, the supernatant liquid decanted, and the sludge placed in contact with the glass electrode of a pH electrometer, a reading is obtained which is characteristic of the material. A representative list of the pH values thus obtained is shown in Table I. In this preliminary account some of the factors will be given which influence pH values of particulate carbon, some of the relations between pH and other properties of colloidal carbon, and something of the significance of these pH properties.
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