docesobremesa:
What do you think gives the best effect, chocolate or coccoa butter?
Is there any difference or it just deppends on the ammount of colour that I put in the misture?
One effect is not better than the other, they are different.
If what you want to do is decorate a shell mold with a high-gloss sheen and air-brush/spatter pattern(s) (Norman Love is the acknowledged innovator and master at this technique) then you want to use cocoa butter.
Spraying chocolate gives you a flock/textured effect and is not normally used on confections but cakes and sculptures.
There is a total difference. You'd use uncolored cocoa butter as the first layer in the mold is going to give you a shiny surface. Them you build up the layers of color in reverse before filling the mold with chocolate to create the shell.
The more colorant you add to the cocoa butter the more opaque it becomes.
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clay - http://www.thechocolatelife.com/clay/