A recent thrift score was this box of unused Ko-Rec-Type, typewriter printing error correction paper. The concept behind this material was to back space over to your mistype, insert this white paper into the typewriter, retype the mistyped characters, thereby “deleting” the original letters as the Ko-Rec-Type has white film that would cover your mistake.
Each sheet has little perforated segments of correction paper that can be used or removed as needed and each sheet is wrapped in a glossy sleeve with the same rad graphics on it that appear on the cover of the box. On the back of the wrap are the instructions for use. Crazy!