Metallic Hair Dye
A: Metallic hair dyes are those products that offer gradual coloring of the hair. They use metallic salts which react with the sulphur in the protein chains of the hair to create a natural looking color in the hair over a period of repeated exposure.
The Sebastian Colourshines line of hair color is a color system with built in shine enhancers designed to give the hair a radiant glow by adding shine into the color as a part of the process. The result is a more light-reflective color from your hair color service.
Henna is a completely different product altogether. Henna is a vegetable based dye that contains no metallic salts. However, just as metallic hair dye can cause an adverse reaction in other chemical services on the hair, Henna has its own problems.
Hair that is colored with henna can be inhibited in absorbing and processing other hair color services or chemical processing.
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See also:
How to dye your hair
Organic hair coloring and metallic dyes
How to color your hair with henna
Problems with traditional hair color after using henna