Message:

<p>[QUOTE=&quot;V. Kurt Bellman, post: 2129373, member: 71723&quot;]Related topic but not entirely:</p><p><br /></p><p>I bought, for a lousy $2, an educational folder made out of vinyl, with ten proof Lincoln cents in it. The PVC film on the coins (not from sulfur, but from PVC) had caused rainbow toning, along with the usual vinyl haze. I acetone treated the 1961 and the 1978-S and the rainbows, and haze, disappeared, and left what little &quot;regular&quot; toning was there. I had never heard of or seen vinyl thin film interference before. Eight remain untouched. I have no idea yet how well that color will photograph.</p><p><br /></p><p>But upon further thought, how have we arbitrarily decided sulfur toning is good, but vinyl toning is bad? Seems funny to me. I want either for both to be good or both be bad, at some core visceral level.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in