I use to be wrking in cosmetic line . Some customers they actually apply it directly onto their lips . Which I find it's disgusting . The way they test it is like free one .
Eyeshadows , powder , blusher , I will use my hands to test it behind the hands or wrist .
Eyeliner , draw on my hands .
Lipsticks , sometimes I will wipe off the first few layers before using the cotton butt or tissue they provide to apply .
All dont dare direct on face except for foundation i will test near the neck and chin area that's the most accurate when getting the right shade .