Hello again hope all is well! I put a small suspected ore sample in cold aqua regia and after giving it some time to soak filtered out a small sample of the liquid. I then placed a small piece of copper pipe into the filtered liquid. I became a bit discouraged when I didn't see anything happening but knowing copper is lower on the reactivity scale I allowed it time and after about a week I noticed the copper pipe started to turn black, then after about another week I noticed a light gray forming over the black, about a month into the experiment I saw this



2 Days later

13 days later



and today which is 11 days later



The submerged half of the copper broke off and has been laying at the bottom the other half is in the above picture



2 Days later


13 days later




and today which is 11 days later




The submerged half of the copper broke off and has been laying at the bottom the other half is in the above picture