Prior to going into the technical diagnose , it is necessary to consult with the client.  This phase is necessary for the best result of the coloring service.

Before starting the coloring service:

• perform a patch test to check sensitivity, in the case of a first approach to cosmetic hair coloring or if it has been a while since the last application ( ei. few years, as sensitivity may vary in time)
• use the color chart as a communication tool, the understand the real desire of the client.
• put at client disposal all the information on the product and the different alternatives in hair coloring, evaluating the achievement of the result.