A quick "dip" might help them but I do not dip coins. Your satisfaction is a must! Check out my other items. Be sure to add me to your favorites list.The item "CHINA 1980 SET OF 3 SILVER OLYMPIC PROOF COINS IN BOX ONE 20-Y AND TWO 30-Y" is in sale since Tuesday, December 11, 2018. This item is in the category "Coins & Paper Money\Coins\ World\Asia\China\PRC (1949-Now)". The seller is "coinguy99" and is located in Quinebaug, Connecticut. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, Indonesia, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Viet nam.