| http://www.w3.org/ns/prov#value | - According to still another aspect of the present invention, there is provided a recording unit which comprises an ink container, and an ink jet-recording head having a heater to supply thermal energy to the ink in an ink flow path supplied from the ink container, wherein the heater has an outermost surface-protecting layer containing at least one of a metal and a metal oxide, and the ink is an ink
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