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UV-visible spectra recorded for the formation of gold nanoparticles. UV-visible spectra recorded for a solution containing: (1) 0.10 mM Mb, 0.50 mM HAuCl4 and 0.75 mM Hydroquinone; (2) 0.10 mM Mb and 0.50 mM HAuCl4; (3) 0.50 mM HAuCl4 and 0.75 mM Hydroquinone; and (4) 0.50 mM HAuCl4. Lines 3 and 4 have not any change with time, so no enlarged drawings are inserted.
