When someone uses this type of media for their originals (also known as a reproducible), they typically intend to make a " blueline blueprint ". This means a print that is actually light-bluish in color with darker blue lines than the light blue background.
[header] How to make blueprints [title] Know the terminology. [step] Whether a cad print, or a manually-produced drawing, these are termed a " reproducible " or sometimes known as your " originals ". These are produced on vellum or some type of drawing medium that allows light to pass through it.