Jewelry made from precious metals is often stamped with a mark to indicate the chemical composition of the metal.
A quality mark contains information about metal content that appears on an article. It is usually stamped or inscribed on the piece. There is considerable confusion about the meaning of quality marks that are seen on jewelry and other items. Here is some information that will demystify terms such as "plated," "filled," "sterling," and others.

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Baking powder and baking soda both are leavening agents, which means they help baked goods to rise. They aren't the same chemical, but you can substitute one for another in recipes. Here's how to work the substitutions and what to expect: