FIELD: thermometry. SUBSTANCE: invention presents mixture of acidic amine, base and component-register which is pH indicator or mixture of pH indicators that changes its color in acidic region with following ratio of component, per cent by mass: acidic amine 19.9-89.9; base 9.0-80.0; component-register 0.1- 15.0. Carbamide and/or its analogs is used in the capacity of base. Acidic carbamide and/or acidic guanide is employed as base. One of following pH registers or their mixture ( phenol bromide blue, Congo red, alizarin red, creosol bromide green, naphthyl red, dinitrophenol, lackmoid, methyl red, iodeosin, hematoxylin ) is employed as component register. EFFECT: preservation of composition color for long-time storage, possibility of usage of one and same composition for entire temperature range of sterilization. 8 cl, 1 dwg
