| http://www.w3.org/ns/prov#value | - In other embodiments of the invention the discrete indicia (7) can be applied as a dye, ink, paint, gel, polymer, or other substance that can entrain hydrogen gas sensor (1) pigment particles (such particles can in some embodiments of the invention also include the catalyst material (2) or the molecular diffusion barrier selectively permeable to hydrogen gas (3) or both as homogeneous populations
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