FlyingAl ✭✭✭✭✭

We had a fun chemistry lab today, and it got me thinking. We took some cents and electroplated them in a solution of zinc and hydrochloric acid (the supplies for which could be bought rather cheaply)… (View Post)

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I forgot one more statistic, which was really dumb of me because it's rather important. Standard deviation between grades assigned by the graders were: Images: 2.751 PCGS contest: 4.523 NGC cont… (View Post)

I used to post some of my images over in the testing forum, but as time has gone on I've amassed a good chunk of experimental images that I don't really post anywhere. I can see myself addi… (View Post)

The difference here is thin hairlines vs. deep adjustment marks IMO. The deeper the gash, the harder it is to hide with angles. Granted, I can't know for sure, but I don't believe the light… (View Post)