Resetting the Grease Pencil tool reverts the tool color, style, and pre- and post-frame ghosts to the default settings.
To reset the Grease Pencil tool
- Open the Tool Settings window for the Grease Pencil tool. (Double-click the Grease Pencil tool icon
if it displays in the Tool Box, or select View > Camera Tools > Grease Pencil Tool > 
in the panel menus.) A Tool Settings window displays, usually next to the Tool Box area.
- Click Reset Tool.