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I created the layer mask and I saw the white How do I switch to black?
For future reference, you can use the Layer>Layer Mask>Hide all option to create a "black" mask.
I just learned a keyboard shortcut for this operation so I thought I would share it here. Simply click on the layer mask and press Ctrl-I to invert it from black to white or vice versa. I assume Cmd+I will do the same on a Mac machine.
To create a black mask quickly, simply hold down the Alt key while clicking the layer mask button.