George, if you're still following this
(and not laughing your butt off - I'm still hunting for snipes), does the urine-soak also turn the metal brown???
And I'm sitting here, with my plastic bottle, and nothing...If I didn't want any, I couldn't stop... 
I ask because I re-barreled my infamous 'Red Five" C96 and want to blend the new metal in with the old...It's all a nice brown patina color...Except the new barrel...