So a couple of weeks ago I set my aerating rig up on my modest supply of finished spirits, a couple of litres each of rum, plum brandy and grape brandy. I checked it today and found the copper pipe I'm using has gone black form the fluid level down.
Is this at all normal? Looks a little disturbing. :scared-eek:
The pipe is super thin, not sure of the exact size (about as thick as a pencil) and was washed in citric acid and water prior to use. I bought brand new from Reece refrigeration.
The spirit themselves seem fine and the black wipes off pretty easily.
Anyone seen this before?