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Undertone, depth and the trick to buying foundation without a counter.
Brands code shades by depth (fair → deep) and a letter or word for undertone (W/C/N, "golden", "rosy"). Buy the depth that matches your jaw/neck, in your undertone. Swatch on the jawline, not the hand — hands are often a different colour.
Find your shade in one brand you know, then use a shade-finder/dupe chart to translate it across brands. Compare the exact shade across stores before buying — and buy one bottle before committing to a set.
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