Choose your foundation as close as possible to your skin colour. The best place to test this is at the jaw line. The reason we test the colour here instead of the wrist, cheek or forehead is because the skin colour will be different on every area. The colour of your neck will be different than the colour of the skin on various parts of your face.
Your best colour will blend into your skin tone at the jaw line and look natural next to the skin tone of your neck. Happy testing…