This brown self adhesive tape was used on an original drawing by a notable artist. The top photo shows the tape used to hold the undermount (a piece of backing mountboard that is used to support the art, it should be the same size as the mount) in place. The middle photo shows this tape removed and the visible staining from the adhesive, which would only have increased over time. The last photo shows one of the 6 pieces of the same tape used to hold the artwork to the undermount, fixed to the front of the artwork which is never a good idea. The crazy thing is the glazing was museum quality glass.
