Where does the term caustic come from in caustic effect?

I am coordinating the translating of the tutorial and I do not understand what caustic effect means or even does. The only meaning I know off is from caustic soda, which is used to remove paint. Searching on Google suggests encaustic, which means painting with wax. So my question: where does this term come from?

Hello and welcome to the forum :slight_smile:

Google searches often give only the most common or popular results.
Wikipedia is often better for specialist or technical terms:

" Concentration of light, especially sunlight, can burn. The word caustic, in fact, comes from the Greek καυστός, burnt, via the Latin causticus, burning."

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Many thanks.