Abstract: An erasable ball-point pen ink is disclosed. The ink is comprised of a rubber component, a volatile solvent, an organic pigment and a nonvolatile solvent, which additionally contains fine powders of silicon dioxide formed by the hydrolysis of silicon tetrachloride, the hydrolysis being carried out by a high temperature gas phase reaction; a semisolid substance; a soft solid substance having a melting point of not more than 130.degree. C.; a combination of fine powders of silicon dioxide formed by the hydrolysis of silicon tetrachloride, the hydrolysis being carried out by a high temperature gas phase reaction, and a semisolid substance; or a combination of fine powders of silicon dioxide formed by the hydrolysis of silicon tetrachloride, the hydrolysis being carried out by a high temperature gas phase reaction, and a soft solid substance having a melting point not higher than 130.degree. C.

Abstract: An erasable ball-point pen ink is disclosed. The ink is comprised of a rubber component, a volatile solvent, a pigment and a nonvolatile solvent, which additionally contains finely divided powders of an inorganic compound which is inactive to other ink components contained therein; a semisolid substance; a soft solid substance having a melting point of not more than 130.degree. C.; a combination of finely divided powders of an inorganic compound inactive to other ink compositions contained therein and a semisolid substance; or a combination of finely divided powders of an inorganic compound inactive to other ink composition contained therein and a soft solid substance having a melting point not higher than 130.degree. C. The ink can be used in a ball-point pen to make it possible to write fine letters and is capable of maintaining highly stable ink traces over long distances compared with presently available ball-point pen inks. The traces produced are even and show good intensity.

Abstract: An erasable ball-point pen ink is described comprising a rubber component, a volatile solvent, a pigment and a nonvolatile solvent, said ink further containing at least one dispersant that is liquid at room temperature and completely soluble in said volatile solvent and which is selected from the group consisting of alkyl phosphate esters, amines and oxyethyleneoxypropylene block copolymers, by which a ball-point pen is available that ensures a very smooth ink flow and letter writing during any season of the year without blocking of the small clearance between the writing ball and the ball holder even when the writing tip is uncapped and exposed to the atmosphere for a prolonged period. The ink is particularly adapted to be used with ball-point pens for writing fine letters.