This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1905 Excerpt: ...the gum has "set." The paper will probably feel
limp; but should the gum surface feel sticky and wet, allow the
prints to dry in the atmosphere, BUT NEVER BEFORE A FIRE. There is
no necessity for the gum to be "bone" dry. The curling of the paper
on the gummed side will serve as an indication that the gum is
sufficiently dry. If it is not convenient to develop the prints
immediately, after having remained in the damp cupboard during the
specified periods, take them out and let them dry in the
atmosphere. They can be developed in any convenient time. It is
quite possible to develop them after a lapse of three or four days.
Development. Place the print, face downwards, in a deep dish
containing cold water. In about two to five minutes' time take a
very soft Siberian hair mop brush (this material is softer than
camel hair) and gently brush all over the surface of the gum,
dipping the brush in the water after every stroke to soften the
touch. This will remove the soft surface of the gum and at the same
time some of the inequalities in the spreading which have not
penetrated to the paper. The picture will now be revealed with a
veil of color all over it. At this period local development may
take place either with a brush or dripping water, or the water tap
may be turned on to hasten the development if the film is
sufficiently hard. Excessive solubility of the film very seldom
occurs; but if it should be inclined to be too soft, owing to
underexposure, the following bath will immediately stop it:
Hardening StocH Solution C (CONCENTRATED FORM) Water... 10 oz...200
cc. Ferric Chloride. 1 oz.... 20 grammes. To make a bath for use
add 1 oz. (25 cc.) of this solution to 20 oz. (500 cc.) of water.
This bath may be used over and over again if filtere...
|Country of origin:
Frederick Charles Lambert
||246 x 189 x 5mm (L x W x T)
||Paperback - Trade
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