Abstract: A gel composition suitable for use as a carrier for adhesives, dyes, pigments or the like is formed from a Group II metal salt or Group III metal salt of an aliphatic carboxylic acid having from 8 to 36 carbon atoms and a chelating agent for the metal, dispersed or dissolved in a liquid dispersant that can be water, a water-miscible organic solvent or a mixture of water and at least one water-miscible organic solvent. The gel contains from about 80 to 96 percent by weight of the liquid and the mole ratio of the salt to chelating agent employed is between about 0.5 to 1 and 2 to 1. When employed as an adhesive carrier, the gel contains from 5 to 45 weight percent, based upon the total weight of the adhesive composition, of a water soluble or water dispersible film-forming adhesive such as polyvinylpyrrolidone.

Abstract: A high speed non-impact printing means including (1) a non-impact printer having at least one pair of print electrodes, and a recipient sheet and closely spaced donor sheet positioned between the print electrodes, with the donor sheet having a substantially uniform distribution of electrically conductive, mobile printing particles dispersed near the surface thereof adjacent to the recipient sheet, (2) a print signal generator, (3) a variable coupling means associated with each print electrode pair for connecting the associated electrode pair to the print signal generator, and (4) a coupling control means for selectively varying the coupling afforded by each of said coupling means. Each variable coupling means comprises an optically controlled variable capacitance device which may be selectively controlled by the control means to couple the associated print electrode pair with the print signal generator by a predetermined capacitance.