dissolved in warm water; the
whites are cleared with a scraper; and any parts which are not intense
enough, or which should be blended by the addition of half tints, are
worked on the proof--to which a tooth has been given by rubbing with
cuttle-fish powder--by means of a stump and an appropriate color, a mixture
of lamp-black and carmine, for example, in very fine powder.

The proofs can also be colored by chemical means (see further on), or with
water colors employed with a solution of chrome alum, 1 to 200 of water,
or gilt, silvered or bronzed with metallic powders applied with the
gilder's size thinned with turpentine on the proof previously coated with
a thin layer of alumed gelatine.

_Second Transfer.--_To transfer, a sheet of enameled or simple transfer
paper is immersed in tepid water until the gelatine is softened and feels
slippery to the fingers. The support is then placed under water at
ordinary temperatures--not under 16 deg. C. (60 deg. F.)--for two three
minutes, then rubbed with a camel brush to remove the air bubbles, which
might be formed on the surface of the image, when, without draining, the
gelatinized paper is laid upon it, covered with the thin oil cloth, and
pressed into contact with the squeegee, commencing in the center to the
sweep off the water, then repeating the operation for the other half, as
explained to apply the tissue on the provisory support. When the whole is
quite dry, which requires three or four hours, the edges are cut with a
penknife and the whole stripped off. It may happen that the proof is
covered with minute, silver-like brilliant spots, which are nothing else
than very small air bubbles interposited between the carbon proof and the
transfer paper. They are caused by the gelatine paper not having been
sufficiently softened or not laid on the proof with proper care. The
defect may also arise from the transfer paper coated with not sufficiently
thick gelatine.

To transfer on any rigid material, the proofs on flexible supports are
coated by floating on the following gelatine solution, then allowed to
dry, and, when wanted for use, immersed in tepid water to soften the
gelatine and secure adherence:

Gelatine 50 parts
Water 400 parts
Solution of chrome alum, 6 parts
4:100

_Development on Absorbing Materials.--_The development of carbon prints on
absorbent material--such as canvas and palettes to be painted in oil,
etc.--c