Eric Keller, digital sculpting teacher at Gnomon School of Visual Effects presents a 3 parts video tutorial to learn everything about Zbrush materials.
[vimeo]https://vimeo.com/85037058[/vimeo]
[vimeo]https://vimeo.com/85037060[/vimeo]
[vimeo]https://vimeo.com/85037061[/vimeo]