The mounted paper or cardboard requires no ground. Glue gesso or casein gesso is used as a ground on the other supports. In an emergency zinc white, ground in casein for use as a color will serve instead of the usual gesso ground to coat a surface. No imprimatura is necessary to reduce the absorbency of the gesso. If a toned ground is desired, it can be obtained by a wash of casein color applied to the finished ground.
[Kay, Reed. Painter's Guide to Studio Methods and Materials. Englewood Cliffs, NJ: Prentice-Hall, Inc., 1983.]
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