Really interested and thank you for your post. I am intrigued and for the last twelve month really just focused on copper pennies 1825-59. I would not intentionally buy a coin to change  its natural condition.....Would prefer a really nice one and problem free   However can you sell me a bottle and allow me to post the results , alternatively sure you will have some photographs ?. Some copper pennies i have bought are considered scarce(other members)will agree,some may not. Would be happy to send you some pictures ?. Although scarce means some have problems and i would not consider sending to get slabbed and be rejected. I would still prefer to conserve them in a good condition,not interested in selling them. I have a few bronze also such as a nice 1862 halfpenny date,1862 three plumes etc that both have a small verd  spot although fine + condition. I mention the above as not looking at £20 coins that i would not of bought in the first place and understand not a remedy for corrosion. Really without listing loads of varieties and condition would be really interested in any of your comments. Thank you and Keep smiling . Pete.