FIELD: conservation of reactive organic substances. SUBSTANCE: stable particles of arylpyrrols having general formula I: 
(I), in which X represents F, Cl, Br, or I; Y halo-C1-C4-alkyl; W cyano group; A C1-C4-alkyl substituted by one C1-C-alcoxy radical; Z hydrogen atom; and M and R, independently, represent H, Cl, F, Br, or I, are prepared as follows. First mixture including arylpyrrol particles, dispersing agent, steric stabilizer, suspending agent, antifreeze, foam suppressor, preservative, and water. This mixture is kept at 40-70 C for 1 to 72 h to give aged mixture. The latter is then reduced into stable arylpyrrol particles. EFFECT: enabled stability of arylpyrrol particles. 19 cl, 2 dwg, 5 tbl, 5 ex
