Hi!
I bought a very old and battered, rusty and scaly la Pavoni off ebay, and I'm currently restoring it - after extensive descaling, there is still a very thin *black* layer on the inside of the copper pick-up tube. Does anyone know what it is, and if it is bad? (My tip is fat from coffee, but I'm not sure if there's some kind of black copper oxide.)
The machine was made between 79 and 82 (it has a flange, but the base is not yet plastic). As far as I can tell, the pick-up tube is brass. There's also a thin black layer on the thread that gets screwed into the group.
Much obliged.
I bought a very old and battered, rusty and scaly la Pavoni off ebay, and I'm currently restoring it - after extensive descaling, there is still a very thin *black* layer on the inside of the copper pick-up tube. Does anyone know what it is, and if it is bad? (My tip is fat from coffee, but I'm not sure if there's some kind of black copper oxide.)
The machine was made between 79 and 82 (it has a flange, but the base is not yet plastic). As far as I can tell, the pick-up tube is brass. There's also a thin black layer on the thread that gets screwed into the group.
Much obliged.