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Originally known as Durinoid, shellac may contain other resins, plasticizers, and hardeners. Paper substrate fibers exposed through chipped edge (under magnification).ĭates 1897 – late 1950s Common Size(s) 7" 10" 12" 16" (diameter) Description Shellac-type is a recorded sound format that consists of a coarse-grooved disc made of shellac resin with varying components, typically clay, slate, and limestone as filler, carbon black for color, and cotton fibers for strength. Paper substrate fibers exposed through chipped edge. Image courtesy of Aaron Coe, The Cutting Corporation. Image by Flickr user Oliver Hammond, available under a Creative Commons Attribution-NonCommercial-ShareAlike license ( CC BY-NC-SA 2.0).ġ0" 78rpm shellac disc. Image by Flickr user Leo Reynolds, available under a Creative Commons Attribution-NonCommercial-ShareAlike license ( CC BY-NC-SA 2.0).Ĭommercially pressed 78 disc label. Shellac disc grooves are considerably larger than those of a microgroove vinyl LP.Ĭommercially pressed 78 disc label. Courtesy of the Danish Broadcasting Corporation. Image by Flickr user DRs Kulturarvsprojekt, available under a Creative Commons Attribution ShareAlike license ( CC BY-SA 2.0). Shellac discs are typically thicker than other discs.įrom this angle, the shellac disc's center spindle hole reveals that the disc has no substrate material.

Although many discs will be found in these enclosures, they are not recommended for long-term storage and should be assumed to be acidic. Shellac 78 with original fiberboard sleeve.