The Evolution of Photography: With a Chronological Record of Discoveries, Inventions, Etc., Contributions to Photographic Literature, and Personal Reminescences Extending over Forty YearsWerge, John, active 1854-1890
History
The Evolution of Photography: With a Chronological Record of Discoveries, Inventions, Etc., Contributions to Photographic Literature, and Personal Reminescences Extending over Forty Years
Werge, John, active 1854-1890
Photography -- History
_How to Make Vignette Papers._--Take a piece of sensitised paper, lay it
under a piece of glass and let it blacken. Then take a camels'-hair
pencil dipped in a weak solution of cyanide of potassium, and paint the
extreme size and shape of the desired aperture. Let it dry, and with a
little stronger solution of cyanide paint _within_ the size and shape,
and then with a stronger solution paint the centre, which will be
perfectly white and semi-transparent. The object of using the three
strengths of solution and painting three separate times is to obtain
gradation, and the edges will be yellow and softened like a vignette
glass. These vignette papers can be attached to the back of the negative
or to the outside of the printing-press, and can be used either in shade
or sunshine without materially prolonging the time of printing. The
cost of production is trifling, as any waste piece of paper and spare
time can be employed in making them, and they do not occupy much time in
making; in fact, one can be made in less time than will be spent in
reading this description. I need not expatiate on the advantages of
being able to make a special vignette quickly. Every photographer must
have experienced the difficulty of purchasing a special size and shape
to suit a particular subject.
_How to Point a Pencil._--Rub the pencil to a point in the groove of a
corundum file. This is a better and cheaper pointer than a Yankee
pencil-sharpener, and it puts a finer point to a blacklead pencil than
anything else I know. Retouchers, try it.
_How to Ease a Tight Stopper._--There is nothing more annoying in the
practice of photography than to take up a bottle and find the stopper
_fixed_. In many instances the bottle is broken and time wasted in
trying to remove the fixed stopper. When such an obstinate stopper gets
into your hands, run a little glycerine round the top of the bottle. Set
the bottle down, and in a few minutes the stopper will be free.
Prevention is better than cure. Keep a little glycerine on all your
stoppers. Glycerine agrees with every chemical in photographic use, and
prevents stoppers and bottles coming to grief. In a thousand and one
ways a little glycerine is beyond all price.
_How to Prepare Albumenized Prints for Colouring._--Pour over them a
little matt varnish. This removes the greasiness, and gives a fine tooth
and ivory-like surface for the artist to work upon.
_How to Remove Silver Stains from the White Ground of a
Vignette._--Touch it with a solution of cyanide of potassium, and wash
off immediately. The other parts of the picture will not be injured.
Public-domain text, read in full here on John Shaqi.
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