Reproducible vellums are ideal if you intend to make minor changes to the plan. They allow qualified architects and engineers to modify the design without having to completely redraw the plan. You may use one of the following items to remove the image from the vellum paper (these can be purchased at a blueprint/drafting supply store): a. Xerographic eradicator fluid such as Michlin film eradicating fluid applied per manufacturer directions. b. A dark grey ink eraser in an electric eraser.