Saving Materials

From ZBrush Info

The Save button in the Material Palette lets you store a modified material to disk so that you can reload it during a later ZBrush session or share it with other users. ZBrush materials have the .zmt file extension.

The default folder for materials is the ZBrush3\ZMaterials folder. Alternatively, to have a custom material load at startup, save it to the ZBrush3\ZStartup\Materials folder.

To Learn About Changing the Default Material Click Here.

To Learn About Using Material Modifiers Click Here.