Another mode of preventing the ill effects of damp in walls on
wall-paper, is to cover the damp part with a varnish formed of naphtha
and shellac, in the proportion of 1/4lb. of the latter to a quart of
the former. The smell of the mixture is unpleasant, but it wears off
in a short time, and the wall is covered with a hard coating utterly
impervious to damp, and to which the wall paper can be attached in the
usual way.