Sulfur mustard. Sulfur mustard, commonly known as mustard gas, is the prototypical substance of the sulfur-based family of cytotoxic and vesicant chemical warfare agents known as the sulfur mustards which have the ability to form large blisters on exposed skin and in the lungs.
Silver jewelry, ornaments, and silverware are traditionally made from Sterling Silver. Sterling Silver is an alloy composed of 92.5% silver and the remainder 7.5% other metals, usually copper. Britannia Silver - Silver that is alloyed with a maximum of 5% other metals.
Silver is a versatile metal with a soft luster that makes for beautiful jewelry. Unfortunately, silver is also pretty fragile compared to many more commonly-used metals, and it can quickly develop tarnish, stains, or scratches. It can also be a bit intimidating to try to clean silver pieces because they are so delicate. Baking soda may remove stubborn tarnish, but don't use it unless you don't mind the risk of damaging the silver. 2  Make a paste of baking soda and warm water, gently rub it into the surface of the jewelry, and rinse when the tarnish is removed.