Chemical Process of Determining Authenticity

This page is the CodyCross answer for the clue below from Popcorn Time, Group 397, Puzzle 3 (Projection Booth).

Question is: Chemical Process of Determining Authenticity

and the answer is: ACIDTEST

Word Meaning:

ACID TEST — (chemistry) A test involving the reaction of an acid with another chemical.

Definitions from Wiktionary.