Thanks, Jim...good info...I actually took these variables into account and also thought of animal sources. This was just a quick test to get a general idea, although, anyone who has used thiourea would already have one...Spark
Now that I’ve had a month’s worth of hilarious laughter,my wife wants to read whatever I’ve been reading!
Thiourea (used in coin dip, removes toning in acid environment, creates toning in alkaline environment) is different from urea (major component of urine).
@Spark1951 I think Jim is right. Everyone’s urine is different from what they eat and drink O and what kind drugs they use. now you going to have to go collect all of your friends pee and set up more test with Lincoln’s..
If you really want to get a patina, buy a fresh kidney , stab it with a knife and slide a bright cent in and bake @ 375 for 1 hour, allow to cool, put into a zip lock bag and set it on a window base ( or in your car) in sunshine for a week or so. Remove coin, it will be interesting. Jim
try to drink straight gin one day, and next day whiskey, i bet the piss will yield different results.