HOW ARE TONED COINS MADE?
- Occurs when silver mixes with hydrogen sulfide.
- This occurs naturally, hydrogen sulfide is anything from air to finger oils.
- Moisture and heat will accelerate the toning process.
- Unlike rust on iron, tarnish or toning doesn’t damage the silver structurally.
WHAT ARE THE DIFFERENT TYPES PATTERNS?
RAINBOW/CRESCENT: Toning throughout coin, typically from old album that wasn’t sealed properly.
EDGES/RING: Toning around coin edges typically from rolls of brilliant uncirculated coins that got slightly unraveled and let air in.
“TAB TONER”: Toning on commemoratives that were sent out in pamphlets. Everything but tab on the coin is toned
WHAT ARE SOMETHINGS I SHOULD KNOW ABOUT TONNED COINS?
- Coins with too much toner or color may be artificial
- There are ways to tone a coin yourself such as introducing hydrogen sulfide
- To avoid toning keep coins in sealed airtight cool and dry climates, reduce humidity/moisture don’t touch with fingers
- Pure gold will not tarnish, but gold coins can since they have other metals in them, specifically if is in them silver.