THIS UNIT TEACHES one method of making an impression on metal that doesn’t require force: etching. It’s a fun way to apply surface design to metal.
In the etching process, acids, often called etchants or mordants, eat away at exposed areas of metal. Different acids work on different metals. For the labs in this book, you need ferric chloride etchant and powdered citric acid. (See Resources for places to purchase them.) Though it’s actually an iron salt, ferric chloride solution works like an acid on certain metals. It is easy to use and is often employed to etch circuit boards. Muriatic acid, a form of hydrochloric acid, also works, but it is much stronger, can burn skin, and creates hydrogen gas as it etches. The ...
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