NOVELTY - Preparing organic zinc salt comprises: (a) mixing a zinc ammonia complex solution with one or more organic acids and/or soluble organic acid salts to form a mixture; (b) agitating (and optionally heating) the mixture to at least partially remove ammonia from the mixture, forming the organic zinc salt; (c) optionally, cooling the mixture to a temperature of 5-30 degrees C; (d) filtering the mixture to isolate the organic zinc salt; (e) optionally, washing the isolated organic zinc salt; (f) drying the isolated organic zinc salt; and (g) optionally, milling the isolated organic zinc salt.    USE - The method is useful for preparing organic zinc salt and coated particles including a rubber product of a tire, a shoe sole, a rubber band, a rubber thread, a belt, an automobile part, a roller, and a latex glove, and a latex rubber thread. The organic zinc salt is useful as fungicide or pesticide (all claimed). No biological data given.    ADVANTAGE - The method is inexpensive and environmental friendly. The coated particles has a lower mooney viscosity and lower minimum torque, improved dispersability, a higher modulus at 100% and/or at 300% elongation, a higher tensile strength, better aging resistance, better abrasion resistance, lower density, and/or lower heat build up.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) making coated particles, comprising (a1) mixing a zinc ammonia carbonate complex solution with one or more organic acids and/or salts, forming a mixture, (b1) mixing substrate particles with the mixture to form a suspension, (c1) agitating (and optionally heating) the suspension to remove substantially all ammonia and/or carbon dioxide from the mixture, forming the coated particles having a coating on it comprising one or more organic zinc salts (1-30 wt.%), (d1) optionally, heating the coated particles at 50-200 degrees C, and (e1) optionally, milling the coated particles;    (2) the coated particle comprising a particle core of silica, clay, kaolin, talc, aluminum silicate, calcium carbonate, and/or carbon black, and a coating on it, comprising a zinc salt of an organic acid (2-30 wt.%);    (3) a composition comprising a rubber, the coated particles in an amount of 2-80 parts per hundred parts of rubber (phr) of the rubber, and optionally, a silane coupling agent; and    (4) a fungicide or a pesticide, wholly or partially comprising zinc dimethyldithiocarbamate and/or zinc ethylenebisdithiocarbamate prepared by the method.