: Watch out for No.1....I think it is the ammonia in the urine that does the
: patination. My sister once chose to use household ammonia to patinate a
: piece of brass overnite - forgot about it, then dicovered the ring had
: dissolved. So watch the time the object is in contact with the patina
: solution!

I didn't say place in the ammonia...just in the vapors! As with any chemical, if you forget to take it out, your in trouble.