The mouth atomizer is an airbrush system that operates without compressed air or electricity. Place the bare tube in a container of paint and blow into the mouth piece of the tube. The created airstream causes negative pressure in the bare tube and draws in the paint that is then sprayed by the airstream. This historical method is also used nowadays precisely because it is cheap and mobile, and no cables are required. It is therefore ideal for use on a rotating spindle directly on a lathe. This is how unusual surface techniques can be created with spirit-based stains.