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Yes, I do worry about it. I perform tests on my silver, as described in this old post:
https://steemit.com/silverbugs/@neoxian/silverbugs-neoxian-s-guide-to-testing-your-silver

OK cool! That was before I was here!

I do have one of the slides made by cct or cybercurtaintwitcher on youtube.
The original slide as far as i know

.
This is my one in zebrano

vlcsnap-2017-08-08-21h37m05s498.png