When I left the studio late one evening I forgot to turn off my new
pickle pot. I was not able to return for several days.
Done that a few times myself, I usually just put water back in it and
let it heat up again. I am using Sparex. I did notice I got a worse
black scum than normal, but scooped it out with an old pair of
pantyhose stretched over a copper wire loop. Another thing I notice
after these episodes, the copper has a tendency to come out of
solution so I take a piece of silver scrap pierce it with a nail and
leave it in the solution for about 5 minutes stirring occasionally.
Use as normal after that.