KARPEN PILE

[profitis]

Are you sure that when you moved the clip that it didn't just make better electrical contact? Happens a lot,with everybody.I'm worried when you say brown because Ag2O is pitchblack and reduced Ag20 is grey-black.I hope no sulfur compounds are in that epoxy because it will cause a browny-black colour if H2S gets in.the Ag2S layer tends to drift off the cathode and darken the whole solution if this happens.in future we must throw a small shiny piece silver into the bottom of container just to check if it goes black.if it goes black then we have to avoid wetting epoxy.I still think a gadget1 type device is best option pomodoro

[profitis]

That pic that I posted of me holding up a piece jewellery silver was brownish due to being left exposed to atmosphere for months.it got a coat of Ag2S.

[profitis]

You must always have excess visible H2 gas in these systems that you can see with the naked eye otherwise you can never know if you've sprung a leak or have limited re-uptake of H2 due to hampered diffusion or depressurized the cell from H2+O2 recombination.

[profitis]

Here's the advantages of a properly sealed and exhaust-piped gadget1: 1) adequate exposure of anode to H2 eliminates rate-diffusion problem.2) any tiny O2 contamination will not depressurize and puncture cell and is quikly diluted.3)electrodes can be easily replaced or disassembled and modified to get desired result.4)electrolyte is far away from interwire joints and rubber stoppers.5) H2 flow can be increased/decreased at will.6) everything in the cell is clearly visible.

[pomodoro]

I still prefer type 3, but with some pressure sensor simply because constant bubbling introduces other contaminants from the bottle. When I ran gas chromatography labs we needed oxygen traps on the uhp hydrogen because it still contained traces of oxygen and wrecked columns after months of usage.  When I dismantle this gadget 3 I will place a hose on the tap with the open end under water to check for a vacuum or positive pressure.  Another run can have the pressure regulator apply a small positive pressure throughout the run.   Regarding the treated silver, it is definitely a brown color, not grey.