I have heard of olive oil used to clean copper coins and was wondering if it is a good conservation ingredient or something to not be considered?
Never, ever use olive oil on a copper coin. Try it on a Lincoln cent and you'll see why.
I have seen large cents with red corrosion on them. Some do not distract from the eye appeal of the coin. While, some are pretty ugly! Has it been anyone's experience to know that a copper coin was cleaned of red corrosion? Or I should say an attempt was made and now the copper coin looks terrible.
Corrosion is oxidized copper, just like rust is oxidized iron. If you remove the corrosion, you will be removing some of the original copper from the coin. That means you will leave pits on the surface where the oxidized copper originated. If the corrosion is heavy, the pits will be deep, because that means more copper has oxidized. Removing the corrosion generally will not improve the grade, but it CAN stop the corrosion from advancing and so keep the coin from further deterioration. Of course, if you keep the coin coated with a little oil, like Blue Ribbon or other such products, that will greatly slow down any further corrosion by keeping oxygen from the surface of the coin.
A large cent is treated with acetone and then conditioned with Blue Ribbon --- How long will the Blue Ribbon protect the large cent from environmental damage? Will another application of Blue Ribbon be required for maximum protection?
There is no single answer to this question. How will the coin be stored after application of Blue Ribbon? If you put it into a cotton liner, much of the oil will absorb into the cotton. Ditto with paper. If you put it into a polyethylene bag, some will adsorb onto the bag, but most will stay on the coin longer. The best thing is to check your coins every so often and see if they have gotten too dry. Repeat when necessary. Brushing with oil is never a one-time application.
Should a cotton liner with Blue Ribbon on it be replaced with a new cotton liner for storage of a large cent? I would think that the soiled cotton liner should stay with the large cent as the Blue Ribbon will continue to protect the coin.
I'm in the same boat. I'm going to attempt to conserve some VF+ late dates. Bob Grellman says in his LC Book to use an Artist Brush and to gently work the areas that have dirt/scum/ lodged around the details with Xylol and to repeat if necessary. Then use some Care or similar product and brush the excess off with a Jewlers brush. ( Where in heavens name do I pick up one of these?) .....Weckberg, you stated previously to maybe roll a q-tip over the dirt/scum. I'm hesitant to use them (q-tips) because I've used them on Silver Dollars and have noticed fine scratches afterwards. BUT, if q-tips have worked you with no problems I'll try. Any more tips would be helpful. Thanks ahead....