If a stylist does not perceive a subtle change in the coloration of the 'natural' product over the course of time, than they might rightfully suspect the use of artificial colorants. Like perfumes, natural fragrances carry both a high and low note. The high note dissipates into a low note. If a product fragrance doesn't settle down but remains 'sharp' to the senses, then again chances are good that the fragrance has been synthetically derived. Harvest time also can effect the fragrance.
Natural fragrances have a tendency to have a subtle, lower note than synthetic fragrances.
However, this is not always true in the case of essential oils such as Sandalwood and Chamomile. Understanding these differences in performance between natural and synthetic ingredients is essential to the salon professional making sound choices. People must alter their decision-making beliefs in order to fully come to terms with this new phase of products.