Abstract: A spirit duplicating master ink contains more than 50 weight % of methyl violet, a binder of poly(vinyl methyl ether) that is of the order of 5 weight % and a 2-ethoxy-ethanol carrier solution of the order of 30 weight % with corn starch filler of the order of 10 weight %. This ink is printed upon a spirit duplicating master to leave a residue with the methyl violet weight % of the order of 73%, that of the 2-ethoxy-ethanol of the order of 7% and that of the corn starch of the order of 20%.

Abstract: A method for forming discrete capsules that contain an active agent, such as a pesticide, involves first forming a suspension of the active agent suspended in a solution of an alkali metal silicate such as sodium silicate or a suspension of the active agent suspended in a liquid coacervate resulting from the addition of a coacervation agent such as acetone to the alkali metal silicate solution. The suspension, preferably in the form of droplets formed by ejecting the suspension through an orifice (e.g. a needle), is then contacted with an aqueous solution of a salt such as calcium chloride which reacts with the alkali metal silicate to form an insoluble silicate (e.g., calcium silicate) coating for the active agent while hardening the dispersed active agent in a silicate core matrix. Thus, capsules of the active agent are produced with an insoluble silicate coating.