Colloidal yellow silver nanoparticles will form rapidly and
reproducibly when an aqueous mixture containing about
2.5 mg/mL soluble starch, 3 × 10−4 M silver nitrate,
2 × 10−3 M sodium citrate, and 5 × 10−3 M D-glucose is
heated to boiling. Soluble starch, D-glucose, trisodium citrate
dihydrate, and silver nitrate (≥99%) were all reagent grade.
Although we use Type 1 Millipore grade water,26 we have
verified that the experiment works well in good quality distilled
water