Message:

<p>[QUOTE=&quot;dougsmit, post: 3110187, member: 19463&quot;]The earliest Roman silver coin I have seen with BD was a Julia Domna of an Eastern mint that looked a bit more base than some and I would estimate at under 50%.&nbsp; That is not a report of scientific study so it may be possible to get hit at a higher silver content.&nbsp; </p><p><br /></p><p>Sodium sesquicarbonate is not easy to find everywhere but can be made by mixing sodium carbonate (washing soda) and sodium bicarbonate (baking soda).&nbsp; I am away from home now and do not have the proportions but will point out that Victor pointed out the possibility of using straight sodium carbonate so you could just add a little bicarb.&nbsp; This is not quantitative chemistry and close will count.&nbsp; Whatever you do, the important thing is to watch the dried coin closely and regularly for a long time after you think it is cured.&nbsp; Daily for a week, weekly for a month, monthly for at least a year and occasionally for several years.&nbsp; If you see new green fluff, the metal involved is lost so you want to catch it when it first shows up and not after it covers half the coin.&nbsp; New green means starting over.&nbsp;&nbsp; The Domna below had BD on the reverse upper left but has been clear for several years.</p><p>[ATTACH=full]789097[/ATTACH] </p><p><br /></p><p>This Volusian Alexandian tet was well involved a year ago and was ruined well before I got it.&nbsp; It still is the only known to me of its type.&nbsp;&nbsp; Show me better.</p><p>[ATTACH=full]789098[/ATTACH][/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