FIELD: production of special-purpose paper. SUBSTANCE: method involves introducing biocide based on water-soluble salt of polyhexamethylene guanidine, followed by converting of said salt into color-forming compound in process medium by treating with reactant including at least one anion capable of forming reaction products of certain color upon reaction with specific colorimetric indicator. Water-soluble salt of polyhexamethylene guanidine is introduced into paper pulp or ready paper web. EFFECT: increased antimicrobic effectiveness of paper and improved chemical protection thereof from counterfeit. 7 cl, 9 ex
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