An aqueous dispersion used for control or calibration of a dry analysis element comprising at least one color producing reagent and a porous layer, which comprises water-insoluble liquid particles having a mean particle size of from about 0.01 to about 10 .mu.m selected from the group consisting of phthalates, trimellitates, phosphates, benzoates, amides, phenols, aliphatic esters, hydrocarbons, halogenated hydrocarbons, adipates, sebacates and natural polymers dispersed therein and a substance which is the same as or similar to the analyte to be determined wherein said substance is selected from the group consisting of glucose, urea, uric acid, creatinine, bilirubin, hemoglobin, triolein, glycerine, cholesterol, triglyceride, (NH.sub.4).sub.2 SO.sub.4, NH.sub.4 Cl, CaCl.sub.2, Ca(NO.sub.3).sub.2, MgCl.sub.2, NaCl, KCl, K.sub.2 HPO.sub.4, (NH.sub.4).sub.2 SO.sub.4, Ca(NO.sub.3).sub.2, and NaNO.sub.3.