Malinos Magic pens

A person draws something on a sheet of paper with a pen. When they then draw over it with a white pen, the color of the drawing changes. The color shifts from the pen barrel to the pen cap. With two-colored pens, this is a transformation. With single-colored pens, this is an erasure. You can also start by drawing something with the white pen and then make it visible again with a single or two-colored pen.