Decide to run other test with milk 3.5%. Last Saturday morning I took that greenish 40 ppm colloidal silver (I use Peter reducer) and mix up in plastic clear cap like 50 /50 ratio and left it outside - temp during day easy reach 35 C till Friday that milk have not go bad at all, only had fat sits on side of cap but milf was still like Saturday - color was little yellow from colloidal silver but liquid and flow as Saturday not smell - still good.
I remember doing that with regular yellow silver and that went bad pretty fast, so seems there is diference between what reducer is use and I do not use regular heating at all only microwave heating after cycle ends.