Think you know how to patch test for lash extensions? Think again. In this episode, we're breaking down the correct way to perform a patch test — using one eye only, applying 10–15 lashes in a single section, and replicating your full service exactly — whether you’re using traditional or light-cured adhesive. We explain why this method matters, what subtle symptoms to watch for, and how even the smallest reaction can signal something bigger. You’ll also learn what to do if your client reacts, and how patch testing fits into a responsible lash artist’s routine — especially in today’s world of rising sensitivities. This episode is a must-listen for anyone serious about client safety, longevity, and lashing with integrity — no matter your adhesive type. Let’s stop guessing and start testing — properly.