Message:

<p>[QUOTE=&quot;BAJJERFAN, post: 2131655, member: 74330&quot;]IIRC the hydrochloric acid treatment was allegedly started back in 1921 which explains why the 1921 Morgans and Peace dollars and subsequent 90% silver issues tone differently that the 1904 and earlier coins. Where and with whom did you confirm the use of HCl? Where in the process is it used and removed? How is it removed? The incipient milk spots are already there simply awaiting for the right conditions to complete the reaction and make them visible. Since silver doesn&#039;t ordinarily react with HCL, then some other species must be the source of the silver in the AgCl. How does the HCl act as an antioxidant. Isn&#039;t that the purpose of the trace/s of copper which is/are present in ASEs? I expect that reaction with atmospheric contaminants is of more concern than reaction of the coin with oxygen.</p><p>Since you can&#039;t see the spots, how would QC inspection find them? I have seen it said/written that the incipient spots can be seen with the aid of a halogen flashlight BEFORE they become visible as the dreaded milk spot, but I have never been able to confirm this in practice.[/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