1913 Half Penny What Grade?

Not worth keeping with the green stuff.
Soak in WD40

I've never used WD-40 or olive oil but I understand that they all, with acetone, achieve similar results. The olive oil method needs a very long soak like days to weeks. The others will pretty much do what they can in a much shorter period of time.

Like I said, I've never used olive oil but unless you use acetone afterwards, I suspect that the oil remaining will provide a little extra shine and a barrier to further corrosion.

For neutralizing the verdigris spot happening on the obverse, there is a product created by a fellow member called Verdi-Care. It too will restore some luster and prevent further corrosion.

I personally would try pure acetone first and see where you're at then. A lot of times for me there is a film on the coin that will be removed and sometimes reveals the underlying sheen.

That's my four half-cents in a nutshell.

Try some Verdi-Care.

http://www.wizardcoinsupply.com/ind...r=verdi+care

I would not recommend acetone, it's OK for some coins but way too harsh for bronze.

F-15 details, environmental damage

Fine