VDI: Know Your Types
The most comprehensive look at VDI across a range of metal detectors. This analysis considers the types behind many US coins; from differences in composition to weight to diameter. Types can change VDI for the same coin - sometimes drastically. VDI numbers provided for Minelab, Nokta, Garrett, and XP metal detectors.
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.