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Optical images of a piece of H2O2 semi-quantitative test paper placed on the surface of (a) Mpol-, (b) OCP- and (c) HAp-AZ31, (d) Mpol-pure Mg and (e) Mpol-pure Ti. Optical images of a test paper moistened with (f) 2 mol l−1 MgCl2 solution and (g) Mg(OH)2 suspension. (h) Color samples at various H2O2 concentrations.
