Fine Silver
This is 99.99% pure silver or fine silver. This silver does not tarnish but may need occasional cleaning to remove body oils, etc. It is softer that sterling silver.
Precious Metal Clay
This is a material that combines an organic binder and water with fine silver particles. The created piece is air dried and fired in a kiln. The high temperatures burn away the organic binder fusing the silver particles together. The end product is solid fine silver. It can be cleaned with a soft cloth, or baking soda.