Certain individuals, due to work or medical conditions, such as masonry workers or the elderly, may develop worn or smooth fingerprint ridges. This can cause difficulty when fingerprinting and result in an unclear fingerprint. In these cases Ridge Builder Lotion is recommended. The ridge builder works by temporarily raising the fingerprint ridges and in most cases provides a clearer print. Simply apply a small amount to the fingers and wipe clean prior to digital live scan or inked fingerprinting. Provided as a 4 oz. pump bottle.