Baking soda mixed with coconut oil, if mixed with citric acid from lemon juice, can have a lightening effect on the skin. These ingredients mixed can brighten your overall tone and complexion due to the vitamin C. But this should be used sparingly as citric acid can be harsh when used on the face.  To make a face mask to brighten skin tone: 1. Combine 1 tablespoon baking soda with 1 tablespoon of Coconut oil and 1 tablespoon Lemon juice 2. Apply to the face for 10-15 minutes 3. Wash the mask off and pat your face dry.