Make a sensitizing bath of a strength likely to give the best results with the negatives to be printed.
Should the print appear marbled, it may be surmised that the sensitizing solution is weak, or that the paper has not been floated sufficiently.
Should a negative be found very hard, a slight modification of the sensitizing solution will be found beneficial, supposing the ordinary paper is to be used.
A weaksensitizing solution, therefore, requires much more attention than a strong one: crystals of silver nitrate must be constantly added to the former.
The sensitizing bath should also never be allowed to be acid with nitric acid, since the resulting prints would invariably be poor.
Hence it is with albumenized paper which is weakly salted with a silver chloride a weak sensitizing bath may be used, whilst if it be rich in the chloride it must be of proportionate strength.
Dust on the paper during sensitizing will cause them, the grit forming a nucleus for a minute bubble.
All paper should be thoroughly dusted before being floated on the sensitizing bath.
Tap water will do, but I would suggest distilled water for making the sensitizing solution of bichromate of potassium.
The operation of sensitizing the tissue must be carried on in a room lighted by a window covered with a yellow blind.
The nucleinate did not produce any reactions when guinea-pigs were given small sensitizing and larger intoxicating doses (0.
Glass or gutta-percha bath to hold the sensitizing solution.
Mr. Melhuish, of Blackheath and Holborn, supplies it in any quantity, and his paper never fails; the operator has then only to perform the sensitizing and developing processes.
It is, perhaps, hardly necessary to add, that the sensitizingand developing processes must be performed in a dark room.
The sensitizingshould be done by a very diffused daylight, and the drying, of course, in a dark room.
The paper has been exposed to light during the sensitizing or the subsequent operations.
In these new processes to the sensitizing solution is added the alkaline oxalate, which effects the reduction of the platinous salt during the exposure to light.
If this second sensitizing be found objectionable, let float the paper for no more than ten seconds; of course this method of sensitizing is not applicable to prepare larger sheets of paper.
The object of this preliminary operation is to render the wood impervious, and therefore to prevent the sensitizing solution to penetrate its texture.
Aqueous ammonia added to the sensitizing solution has for its object to permit one to keep the sensitive tissue for a somewhat longer period, but it renders it less sensitive.
The sensitizing solution is similar to that published by Mr. Endemann, viz.
The process of sensitizing must be done in a weak artificial light, such as at night by ordinary gas or lamp light, or in the very feeblest daylight.
Brown or purple tones may be had by sensitizing with the following solution instead of the above: Distilled water 1 oz.
When the paper is thus prepared, and the sheets of glass each in its place, they are coated by means of a brush with a sensitizing solution on the side which comes into contact with the paper.
None of the hard papers of good grade require the use of gum in the sensitizing liquid.
When the apparatus is in continuous use, time may be saved by having a convenient arrangement for drying the sheets that have been coated with the sensitizing liquid.
If the soaking is too long continued in water that is much discolored by the sensitizing preparation, the sheets become saturated with the diluted preparation, and they may become slightly colored by after exposure.
A few minutes' soaking will remove nearly all of the sensitizing preparation which has not been fixed by the exposure.
This preparation I continue to use when much time may elapse between sensitizing and printing; but, when the paper is to be printed immediately after sensitizing, I use a larger proportion of citrate of iron and ammonia.
The proportions of the sensitizing liquid, as originally given me by Mr Barnes, were as follows: Red prussiate of potash.
The process may be divided into the following operations:-- Saturation or sensitizing of the paper.
It will be evident to anyone that the fancy forms of sensitizing have been carefully avoided--floating on the back, floating on the face, etc.
For working by the previously chromated paper method, the sensitizing solution is made up of one part of bichromate of potassium dissolved in ten parts of water.
All those who use papers waxed by Mr. Le Gray's process, know how many, how tedious, and how difficult are the operations before the sensitizing by nitrate of silver.
With regard to the sensitizing by nitrate of silver, the bringing out of the image under the action of gallic acid, and fixing the proof by hyposulphite of soda, I follow the usual methods, most frequently that of Mr. Le Gray.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "sensitizing" in a variety of sentences. We hope that you will now be able to make sentences using this word.
