A chemical substance (usually an acid) used to carve or dissolve away material from a surface, commonly used in art and manufacturing.
Derived from 'etch' (from Dutch 'etsen'), combined with the suffix '-ant' indicating an agent or substance that performs an action. Etching dates back to the 1500s as an artistic technique.
Etchants are the reason computer chips can be made so small—manufacturers use them to precisely carve billions of transistors onto silicon! It's the same chemistry that artists have used for 500 years to create beautiful prints.
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