| http://www.w3.org/ns/prov#value | - More particularly, the present invention relates to curable compositions comprising aqueous solutions or colloidal dispersions of silicates containing a pigmentary hardener corresponding to the formula Mx My 'Oz where M is a divalent or trivalent metal ion, M' is an ion of a metal from Groups III, IV or VIB of the Periodic Table of Elements, provided M and M' are not the same metal ion, x is 1 or
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