in water sodium citrate soln. in water added dropwise into the silver nitrate soln. in water; centrifugation, washed with distilled water, absolute alcohol in sequence and dried in air;
in water
soln. of HAuCl4 added 1percent citrate within period of 5 s while refluxing with vigorous stirring under N2 atm.; Au soln. kept refluxing for period of 1 h and then left to cool to room temp.; detd. by absorption spect.;
