| http://www.w3.org/ns/prov#value | - constituting a pigment has an acid group such as a carboxylic acid group, a sulfonic acid group or a phosphoric acid group, the compound constituting the pigment is dissolved in a solvent, and, then, is neutralized by adding an inorganic base such as sodium hydroxide or an organic base such as sodium acetate to result in a reduced solubility to be precipitated.Further, there is mentioned a method
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