With the growth of hand tools in woodworking, or should I say the return to hand tools in woodworking, many up-and-coming furniture makers think that the final pass on a panel or surface is always with a smoothing plane or scraper. If you think that you may be wrong.
Furniture makers in the 18th- and early 19th-centuries did some sanding – I guess a better statement would be that they did further smoothing of the surface. Not with sandpaper as we know it, but with shagreen.
“In the time of Roubo, these abrasives would include sandpaper and shagreen (sharkskin or ray skin) pumice, or vegetable reeds and fibers,” wrote Don Williams on a Lost Art Press blog.
Shagreen can be produced from horse hides and fish skin. Shagreen made from fish skins is what was used in woodworking. This material is commonly referred to as sharkskin, but most of the shagreen is from small tropical sharks (known as dog-fish) and rays.These skins had a rough, hard surface of calcified papillae instead of scales.
Early fisherman would catch the sharks and rays, skin the fish for the flesh then stretch and dry the skins. The dried untreated skins were what carpenters and furniture makers used to smooth and polish wood surfaces.
Treated skins were leather-like. Once smooth and supple, shagreen could be dyed different colors and was often used to cover small containers, watch cases and sword handles. (The container shown above was made by John Paul Cooper in 1931.)
Today you can find many products made with shagreen or faux shagreen, but I could not find stretched and dried, untreated skins for smoothing my woodworking project. If you’re near the ocean and an avid fisherman, maybe you could revive shagreen. Or as woodworkers, maybe we can simply accept and use sandpaper.
If you are interested in learning more about finishing, there is no better place to turn than “Flexner on Finishing” by Bob Flexner. For additional information on sanding, download a copy of Robert W. Lang’s “Sanding Finishes.”