Any type of paper contains ions of heavy metals. Being the catalysts of the oxidizing destruction of cellulose, they decrease paper longevity. The possibility of paper stabilization as a result of treatment with chelates (OEDF and DTPA) and calcium-chelate compound was investigated. The effect of paper stabilization was achieved by removing ferric and cupric ions and simultaneously introducing calcium ions. Mechanical strength, degree of brightness, pH of cold extraction of the paper treated as well as untreated were taken as a function of time of artificial aging. The evaluation of stabilizingeffect of chelates and calcium-chelate compound on paper was made by using the kinetic concept of strength and thermogravimetric analysis. See also AATA 18-1158.