KARPEN PILE

[profitis]

Use 925 jewellry silver for the longrun tests pomodoro.it will not fail us.

[profitis]

Mystery pecipitate couldve been unreduced Ag2CO3(yellowish-white) still embedded in the black layer that spread over entire solution.that has happened to me before.what happens is the Ag2CO3 dislodges from silver during prep then withstands electroreduction.that's why you have to cathodize it shitless to get back to Ag if twas thick coat.An black Ag layer that is too thick and fine will also naturaly trap too much H2 buildup in its pores and insulate from the gadget electrolyte and hamper gaseous diffusion away from the cathode

[profitis]

To test for purity of silver,simply throw into HNO3,it must give clear solution and brisk evolution of NO2.jewellry silver will give a blue tint due to trace copper.AgNO3 solution will evaporate and decompose direct to silver-color silver when heated on burner in a testube(300celcius)

[pomodoro]

Cheers for all the advice. I will test purity soon.  I can dissolve in nitric and test ppm of silver with icp. Time is my enemy at the moment. There are a few more metals of like to try as cathodes and I will then run it for a week.   When I anodized the larger silver electrode, some light blue carbonate formed. You are spot on about the reduction being difficult.  With the copper no conducting oxide formed in koh it kept flaking off as it was being produced. So a simple nitric etch was all I used.

[profitis]

I'm glad we got that problem out the way pomodoro a sigh of relief coming out me now.you might want to try graphite now aswell,fully dewaxed on hotplate,and inside not outside the device.success is imminent.