Viral Korean TirTir Cushion Foundation on black / brown skin. How to use it tutorial. I’m wearing 35N Walnut. Reviews say it can oxidize so a slightly lighter shade is okay. Apply thin layers to reduce oxidation as well. makeuptutorial koreanbeauty blackgirlmakeup makeupreel summerfoundation summermakeup amazonprimeday LTKSummerSales LTKBeauty