Is there major risk of tarnishing the bar when 'home' testing? Are the rates reasonable to have a professional do it?
Unique way to home test without damaging .999 silver:
Hard boil an egg. Once finished, while egg is still hot, mush it up and put on a plate. Place silver near egg and wrap up with saran wrap, so mostly air tight. (Could also use Tupperware or anything that keeps air from escaping whatever you are using.) The sulfur gases released from the egg will turn the .999 silver coloring into a beautiful rainbow.
To return back into shiny silver color again. Wash with a little soap in warm water, dip in acetone for 3-5 seconds. Rinse off with water....and .999 silver back to original condition, undamaged.
EDIT: If you have children, it's a fun science experiment to do with them.
Can you eat the egg after?
I don't see why not...though, I have only tried this once (after seeing on Youtube) and I did not eat the egg.
I'm gonna try this without the silver bar and just eat the egg
