How does ps set off pink?

There is a button in front of the new layer in the lower right corner of PS. Click it with the mouse and a list of options will appear. Click on it and a new layer mask will be created on your layer. This is a mask with optional colors. Double-click the mask window, and a dialog box will appear in the window above the layer. There is usually "red" in the middle of the top. Click it with the mouse and a column will appear. Select the neutral color below, and then