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Abstract: The fundamental equation [Is = limc®0 [(ns/nu) ln (ns/nu)]] of information chemistry was evaluated for the imprinting information (I) of a resin imprinted with phthalocyaninetetrasulfonic acid and methyl orange. As I becomes greater, the more adhering sites the imprinting substance occupies; however, the more uncertain I becomes, the nearer c ® 0, then the 1st measured points c1s and c1u (c1s and c1u are the equil. concns. for the imprinted and nonimprinted resin, resp.) are averaged from the graphic isotherm, and the distance ratio AC/BC is detd. by (c1s + c1u)/2. From the isotherms, which are averaged as straight lines, the ratio of the gradient factors was inserted in the null point. Graphically ns/nu is 2.1 and 1.4 for the tetrasulfonic acid and methyl orange, resp., and I is 1.56 and 0.47 mole-nepit (mole-Nepers digit).