It should not be visible, but simply even out your own skin tone. When choosing foundation, test the shade on your jaw or neck, not the back of your hand or the inside of your wrist. These are not the same color as your face, and they also do not have the same amount of oils as your face so the color will be totally different!
Check the color in natural light after it has set in (about 15 minutes), to reveal the true color. Remember to change the shade of your foundation with the seasons when necessary.
Standard Size - 20 grams volume of powder in a jar with sifter