| http://www.w3.org/ns/prov#value | - cluding a reactant fluid, the other two reservoir chambers, each chamber including an ink, wherein (1) at least one of the inks undergoes a reaction when contacted with the reactant fluid, the reaction being (a) a pH-sensitive colorant precipitating out of the ink when a certain pH range around the colorant is achieved, (b) a colorant precipitating out of the ink when the colorant binds with a pre
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