Abstract: A process is described for encapsulating a solution of color reactants of color-reaction systems present in an aqueous emulsion accomplished by means of conventional microencapsulation processes, in which the color reactant is first dissolved in a solvent and a non-dissolver, which may insignificantly dissolve the color reactant, is mixed into the resulting solution in an amount that establishes a supersaturated solution while mixing at high speed, the supersaturated solution is emulsified immediately in the aqueous phase while mixing at high speed, and immediately thereupon the encapsulation is performed. A vegetable oil C1–C8 alkyl ester is used as the solvent. This process has economic and technological advantages. For example, it can be used to produce microcapsules that have an advantageous narrow monomodal particle distribution, which results in improved writing performance.

Abstract: A fabric printer ribbon impregnated with a transfer medium comprised of a vehicle liquid and coloring agent dispersed in the vehicle liquid. The fabric printer ribbon may further contain property-improving additives. As the coloring agent, the ribbon contains a color reaction product in the form of a Lewis-acid/Lewis base color complex comprised of an organic chromogen and a color developer. The coloring agent is dissolved and/or dispersed as fine particles in the vehicle liquid. Such a fabric printer ribbon displays the advantage of correctability by means of an inhibitor of the color reaction. The corrected sheet can be typed over in customary fashion by means of the fabric printer ribbon in a second track of a fabric printer ribbon.