When working with a custom brush, you may need to switch to a built-in brush,
`for d tail work. 4 example, pressing period selects the 1 pikcel brush.
for detail work. For example, pressing . selects the 1 pixel brush.
You can get back the last custom brush by using the Restore function.
`You can also restore the last custom brush by clicking the brush tool i con,
You can also restore the last custom brush by clicking the brush tool icon,
with the right button.
Additionally, the keyboard equivalent, Shift-B, will also restore the brush.