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A shows turbidity variation within the three grades of mucin as represented by hardness index; B that for density of solubilised mucin; C that for density of solid mucin; D that for kinematic viscosity; E for hydration; F for protein content. The hardness index (HI) 0.6 = soft mucin, (HI) 1.2 = semi hard mucin and (HI) = 1.8 = hard mucin.
