Natural Color System—A New Method for Evaluating Skin Colors During Argon Laser Treatment of Port-Wine Stain

Abstract
In the natural color system (NCS) the notations are based on psychometric experiments and give a cognitive description of color appearance. It is shown by clinical examples that the NCS is a useful method for evaluating laser treatment results, and that NCS also makes it possible to express the results in numerical values in 2 ways.

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