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Etching a Board Using Ferric Chloride
Step 2: Warming the etchant

Ferric chloride works best at slightly above room temperature, so it's a good idea to warm it before using it. It will still work at room temperature, but it will not work as quickly, and your traces might not be as clean.

A simple way to warm the etchant is to submerge it for 10 minutes or so into a container filled with very hot water.

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