Silver is a precious metal that reacts to hydrogen sulfide. When exposed to the natural hydrogen sulfide and moisture in the air, the silver reacts with the gas and becomes discolored. Over time, this dark layer will entirely cover the silver bar and tarnish it completely.

Are tarnished silver bars worth less?

Does Silver Tarnish Affect the Silver Value? With lower premium items such as silver rounds and silver bars, tarnishing really doesn't have an impact on the value of these items. ... When it comes to numismatic items, tarnishing starts to have more of an effect on the price.

How do you keep silver bars from tarnishing?

Store your silver in plastic or zip lock bags – This will help slow down any reaction to the surrounding air or brushing up against harsh surfaces. Use charcoal to remove Hydrogen sulfide – Carbon takes Hydrogen sulfide out of the air which will slow down damage.