Cut a double band of paper 2 or 3 inches deeper than the cake tin and rather longer than the circumference. Fold up an inch of this band on the double fold and make a mark. Open out and make cuts along the marked-off inch of the paper an inch or so apart. Arrange this band inside the cake tin, making the notched section of paper lie flat on the bottom of the tin. Then cut a double round of paper to fit inside the tin and lay it smoothly on the bottom. The paper must lie perfectly flat; there must be no wrinkles. If the cake tin is very large, three or four folds of paper may be used. If the cake mixture contains a fair amount of butter, no grease is required, but if there is little or no fat in the cake ingredients, the paper and tin should be brushed lightly with clarified butter.