Late Roman Bronze Coins

Coin talk => Unofficial coinage => Topic started by: Victor on June 19, 2012, 12:16:13 PM

Title: Silvered VLPP barb
Post by: Victor on June 19, 2012, 12:16:13 PM

I wonder if this was done intentionally or was just the result of the minting process.

From my page on Metallurgy
http://www.constantinethegreatcoins.com/metallurgy/ (http://www.constantinethegreatcoins.com/metallurgy/)

"For flans with more than 5% silver, cold hammering followed by annealing resulted in lead and silver being forced to the surface. A dilute acid bath would give the flan a silvery surface. For flans that contained less than 5% silver, a bath in molten silver chloride displaced silver and deposited it on the surface, which gave the flan a silvery wash. Hot working and blanching prior to hot striking also enriched the surface silver content."

photo from Beast Coins

Title: Re: Silvered VLPP barb
Post by: Victor on March 28, 2016, 06:28:34 PM

another recently acquired Siscia VLPP barb with mostly intact silvering    17mm  3.0gm