| http://www.w3.org/ns/prov#value | - In conventional methods, when the color ink containing a polyvalent metal salt in order to prevent bleeding was repeatedly ejected from a recording head, sometimes, the outermost surface protection layer made of at least one of metals and metal oxides, such as tantalum and tantalum oxide, formed on a heater (heater element substrate), which applies thermal energy, is dissolved, and as a result, br
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