Leave a small margin all around the edge and then
place some decorative form therein. Make allowance for flaps on
two sides, as shown, which may later be turned back and folded
under when the metal is worked. It should be noted that the
corners of the design are to be clipped slightly. Also note the
slight overrun at the top with the resulting V-shaped indentation.
To make a design similar to the one shown, draw one-half of it,
then fold along the center line and rub the back of the paper with
a knife handle or some other hard, smooth surface, and the other
half of the design will be traced on the second side. With the
metal shears, cut out four pieces of copper or brass of No. 22
gauge and with carbon paper trace the shape and decorative design
on the metal. Then cut out the outline and file the edges smooth.
Cover the metal over with two coats of black asphaltum varnish,
allowing each coat time to dry. Cover the back and all the face
except the white background. Immerse in a solution of 3 parts
water, 1 part nitric acid and 1 part sulphuric acid. When the
metal has been etched to the desired depth, about 1-32 of an inch,
remove it and clean off the asphaltum with turpentine.
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