This, by the way, is equally applicable to paper transfers; and it is
to be remembered that the toning comes last of all. It is a rather
difficult matter to clean a ground opal which has been used two or three
times, and acid must then be had recourse to (nitric acid is as good as
any); but by transferring from the support on the ground surface, all
stains are at once avoided.
On the flushed glass, or on the pot metal (unground), after well
cleaning the surface it should be covered with a substratum of egg. Then
the picture is taken direct, not transferred; that is, the plate is
exposed direct in the camera, regularly proceeded with, and, when dried,
varnished with a pale negative varnish, or with dead varnish if intended
for chalk or water-color. This, when a good negative is used, gives a
remarkably fine picture, not requiring a vestige of retouching, and
having likewise the invaluable advantage of being perfectly durable
if varnished with the negative varnish. Moreover, on that, effective
pictures may be made in oil with simply tinting.
A gentleman, who has a right to be considered a good judge in all art
matters, on looking at one of these pictures transferred on flushed
glass, said it was one of the finest productions of photography.
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