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I always get tripped up by the “uncommon” ones — — so my quiz hack is scanning INCI names: -amide/-ide (niacinamide, ceramide) usually = barrier helpers, while -ol/-glycol (glycerol, propanediol) tend to be humectants/solvents. If I’m stumped, I quickly plug it into https://incidecoder.com between sessions; super fast. Caveat: “unscented” can still hide fragrance under “parfum,” so I never count that as fragrance-free — anyone else fall for that in these quizzes?