TRESORAn original drawing is the sheet the print came from, or the sheet that was never printed. It exists once. A crease is forever. In the overview Security for collectors, it sits with drawing and paper, not with the issues, even if it comes from the same world.
What breaks without a thief
Light, acid from the backing board, adhesive tape, a folder that is too tight, moisture that makes the ink run. You store it flat, in a mat of acid-free board, in the dark. Framed on the south wall, it is a display, not storage. Behind glass, the climate can build up if the back is the wrong cardboard.
When someone comes
A sheet in a folder is light and looks like paper. Framed on the wall, it is visible. You do not hang the most expensive sheet in the hallway. It lies flat in the document cabinet, or in a folder that does not stand by the door. You photograph the signature once, sharply. The photo is kept somewhere else.
The folder
Artist, year, technique, dimensions, where the sheet comes from, receipt. One sentence on whether it is a preliminary drawing, a finished drawing, or a later sheet. This distinction is the price. Without it you have "a drawing".