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The efficiency of bioscouring treatment applied on 50 % of flax + 50 % of cotton material by determination of the residual Ca2+ was studied. The treated samples were analyzed using a spectrophotometric method based on the measuring of the colour strength [K/S] of the bioscoured material after dyeing with Ruthenium red and Alizarin. The reflectance (R %) at 540 nm was measured and [K/S] values were calculated [1, 2]. The purpose of bioscouring was the removal of morphological impurities present in the cotton and fl...