Different brands of dry cellulose acetate film behave differently when used to reproduce textures of etched carbonate rocks and internal structures of fossils. Kodapak, which tears with a sharp border, dries rapidly on an acetone-flooded surface and can be removed in 2 to 3 minutes, or left in place for several hours. Bubbles generally are rare. Vuepak which tears with a jagged border, dries relatively slowly but should be removed after 2 to 3 minutes be cause the peels tend to become wavy and distorted. Bubbles are relatively common. Vinyl acetate does not usually develop shrinkage wrinkles but it does not adequately reproduce etched surfaces.