| http://www.w3.org/ns/prov#value | - Then, the colloidal dispersion of gold-containing noble metal microparticles (gold-coated silver microparticles) that has undergone the above-mentioned desalination treatment is concentrated by a reduced-pressure evaporator or a method such as ultrafiltration, etc., to obtain a concentrated dispersion of functional group-containing compound having mercapto groups (???SH), sulfide groups (???S???),
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