This invention pertains to improved methods of classifying skin types as well as improved methods for determining the appropriateness of products and evaluating methods for treating particular skin. The methods typically utilize a "skin type" database containing one or more quantitative measures (e.g., NMR data) of skin properties. The database can optionally include various qualitative measures of skin as well (e.g., Glogau scale and/or Fitzpatrick scale values).
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT
 This invention was made with government support under Contract No. DE-AC02-05CH11231 awarded by the U.S. Department of Energy. The government has certain rights in the invention.