Silverskin

On dried green bean coffee, the thin inner-parchment layer that clings to the bean and lines the crease on the flat side. Silverskin becomes chaffChaff is paper-like skin that comes off the coffee in the roasting process. Chaff from roasting is part of the innermost skin (the silverskin) of the coffee fruit... and falls off the bean during roasting. It is a fine inner layer coating the seed, between the thicker parchmentGreen coffee still in its outer shell, before dry-milling, is called Parchment coffee (pergamino). In the wet process, coffee is peeled, fermented, washed and then ready for drying... and the bean. Formerly, dry mills would polish coffee to remove the silverskin, since the coffee looked better to the buyer. But this generates heat that damages cup quality, so the polishing step is discouraged.