Dear All;
Pretty new here and my batches of colloidal gold made from gold chloride are still unstable, after a week at best they turn purple and a precipitate starts to form, kindly direct me to the method best suited with the most stable result.
I have also tried the Turkevich citric acid reduction method on Platinum Chloride, tastes horrible = does not work, any ideas how to process PtCl3 into colloidal Pt?
I got all my chlorides ( AuCl4, PtCl3, CuCl2) from the same peroxide method, 35% HCL + 30% H2O2 extremely slow drip + heat + lots of time.
From looking at the pure metal one might think that platinum would give a paler colour than gold, not so - Pt when oxidised is more colour intense and beautiful than Au - more of a crystal orange, great character, would love to try this as colloid but no know how :-)
kind regards, Alexander