It seem like I was partially wrong about copper's reactivity. Seems the main reaction is with oxygen and not much else. I say partially because dissolved oxygen and CO2 in water solutions might cause a constant oxidation and the acid striping it off, would, in practice end up with more than just the patina of the copper going in into solution.der wo wrote:At least in acidic environment perhaps oxidized copper (patina) reacts more than clean copper because it gets solved more, so there are more copper ions in the mash.
The 100ml of wash with copper, left there since friday, is staring to get a blue-green tinge.
Right, that is why I would like to take the variable of how much contact there is in the boiler or the condenser out of the equation.Those two points match with your observation, that the sulfur reduction needs much time.
Don't have the time now but I do intent to try a copper wire in the fermentor as soon as I get a chance.