| http://www.w3.org/ns/prov#value | - A heat mode recording material according to claim 1, wherein said metal ion is a monovalent, divalent or trivalent metal ion selected from a group consisting of Na+, K+, Li+, Cs+, Ag+ or Hg+ ; Be++, Mg++, Ca++, Sr++, Ba++, Cu++, Cd++, Hg++, Sn++, Pb++, Fe++, Co++, Ni++ or Zn++ ; or Al+++, Sc+++, Fe+++ or Y+++.
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