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<p>[QUOTE=&quot;Drusus, post: 515764, member: 6370&quot;]I have used Biox quite a bit. The Biox is not an acid thats for sure. I do not know what it is (If I did I would mix it up myself).</p><p>&nbsp;</p><p>Biox, if used in a strong solution or for a long period of time will remove the patina exposing pink copper which is pretty much the natural color of copper. Copper is rather supple in its pure state and (when fresh) has a pinkish or almost orange (peach) color...and that is often what you get when you strip an ancient LRB...using something like vinegar, electrolysis, or other things that strip it bare...It is not turning the coin pink, it is turning it back to the natural color of pure copper.</p><p>&nbsp;</p><p>With Biox it depends on the coin and how bad the verdigris it. You might simply be unable to save the patina if you are forced to keep it on too long but I ALWAYS dilute it to about 1-3 or 1-5. All the same its better to save the coin and let the patina go...I have stripped coins that are still very attractive.</p><p>&nbsp;</p><p>I have been able to also spot treat verdigris with Biox which, if done right, it will not strip the whole coin and only affect the verdigris.</p><p>&nbsp;</p><p>One thing I have found that people neglect to mention when treating verdigris (at least with Biox or other similar methods) is the manual removal of the affected spots....this is very important I think. For any collector this is bad but for a modern collector this is probably even worse to hear as with an ancient, a pit or two in the surface is quite acceptable...but before you treat the verdigris, its best to take a needle or something similar and break up the powdery area, kind of digging out the infected area...For people who just want to soak it and have it go away with out manual cleaning of the area...this might be bad news...lots of times the verdigris, even when it appears just to be surface spots...go deeper into the coin and you need to stir it up and expose those parts or you will miss them and the verdigris will come back with a vengeance.</p><p>&nbsp;</p><p>I have had some success with soaking in a mixture of between 1 to 5% of sodium </p><p>sesquicarbonate as well.</p><p>&nbsp;</p><p>Like most though, manual removal of the spot can be important and using either SSC or Biox to stabalize the remainder is the best bet.[/QUOTE]</p><p><br /></p>

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