Cleaning Coins: Alkali Washing with Sodium Sesquicarbonate

Learn how to safely and effectively restore ground find copper, silver, and gold coins. In this post I show how an Alkali Wash can be used to remove build-up from a coin’s surface. I always recommend testing on worthless coins to understand how the process works and may impact your coins. It is entirely your decision to use this process on coins that may have value.