ollers have been lying for weeks with a coating of ink dried on to
the surface--a circumstance that often occurs, more especially when
colored inks have been used--get an ordinary red paving brick (an old one
with the edges worn away will be the best), place the roller on a board,
then dip the brick in a trough of cold water, and work it gently to and
fro on the surface from end to end, taking care to apply plenty of water,
dipping the brick in repeatedly; and in a short time the ink will
disappear. Nor is this all; for if a little care and patience is
exercised, it will put a new face to the roller, making it almost equal to
new; the coating of ink having, by keeping the air from the surface,
tended to preserve the roller from perishing. Sponge off clean.

A RECIPE FOR PRINTERS' ROLLERS.

Best white glue, one pound; concentrated glycerine, one pound. Soak the
glue over night in just enough cold soft water to cover it. Put the
softened glue in a fine cloth bag, gently press out excess of water, and
melt the glue by heating it over a salt water bath. Then gradually stir in
the glycerine and continue the heating, with occasional stirring, for
several hours, or until as much of the water is expelled as possible.
Cast in oiled brass molds, and give the composition plenty of time to cool
and harden properly before removing from the mold and inking. See that the
ink is well spread before bringing the roller in contact with type.

TEMPERATURE OF THE PRESS ROOM.

The temperature of the press or machine room ought to be as near as
possible the same as that at which the ink is manufactured--_viz._, 16 deg. of
Reamur (68 deg. Fahrenheit). If the temperature of the room, and consequently,
of the iron receptacles the ink is kept in, be considerably less, the
varnish of the ink will stiffen, the paper will adhere to the type and
peel off, or, if this does not occur, there will at least be too little
varnish in the ink remaining on the type, and too much carbon, which, of
course, will not sufficiently adhere to the paper, and may be wiped off
even when the paint is perfectly dry. But if the temperature of the
work-room be too high, the varnish becomes too thin, the ink loses its
power of covering well all parts of the types, which then look as if they
had been printed with lamp-oil. Colors of different hues require generally
a somewhat higher temperature than black, say 70 deg. to 75 deg. Fahrenheit, but
any printer who wants to