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The photographic news
- Bandzählung
- 12.1868
- Erscheinungsdatum
- 1868
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 488, January 10, 1868
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Zeitschrift
The photographic news
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Band
Band 12.1868
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- Titelblatt Titelblatt I
- Kapitel Preface III
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- Register The Index To Volume XII 619
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Band
Band 12.1868
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- The photographic news
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14 THE PHOTOGRAPHIC NEWS. [January 10, 1868 for either collodion negative or positive, as in either case it must necessarily be exposed to the action of light, which produces discolouration, and facilitates the change which destroys its coherent qualities. THE USE OF A SECOND STUDIO. Mr. Nonrax, of Montreal, speaking of the production of pictorial studies by means of photography, recommends all who would excel in this direction to have a second glass room as a private sanctum for study, in which he may be free from interruption in his special work. Addressing our excellent contemporary, the PhiladelpTiia Photographer, he says:— “ One of the greatest luxuries a professional photographer can have, so thinks the writer, is to own a well-lighted sanctum or studio, to which he can retire, and in which he can carry out, without fear of interruption, any fresh ideas which may suggest themselves from time to time. It is not advisable to disturb the studios or rooms in every day use, which, if well appointed, ought not only to bo carpeted, but abound in suitable pieces of furniture and choice ornaments, such as are usually seen in drawing or sitting rooms. If possible, let such be real, and so arranged that sitters may have somewhat of a home feeling. The sanctum above referred to need not be carpeted, but be covered with some such stuff as Kamptulicon, which looks so brown and shabby to begin with, that you never fear spoiling it, but as occa sion requires, with perfect freedom, pile cordwood on it, build cottages, form sandy beaches with boats drawn up, erect tents, plant trees, crowd solid blocks of ice, form snow- wreathed plains, or, as in the case of the picture for this month, introduce a frozen lake or stream, on which the skater may appear to glide. All this, if it does not afford a change of air, at least gives a change of scenery, and by leading you out of the every-day rut invigorates and re freshes the mind. Do not think that carrying out such ideas involves an outlay of money without any return. In most cases it will be found a very profitable branch to add to any photographic business.” PRESERVATION OF PASTE, GLUE, ETC., FOR MOUNTING. One of the chief dangers to the permanency of a photograph which can arise from the nature of the mounting material is due to the process of decotnpositon or fermentation incident to such materials by which acid conditions are generated. Starch and flour-paste and solutions of gum readily ferment; gelatine and gum are apt to decompose. But there is an efficient preventive of either form of decomposition, which, although tolerably well known, is rarely made available by photographers. A trace of carbolic acid prevents decompo sition in albumen, gelatine, glue, and similar substances, and will also effectually preserve from any tendency to fer mentation paste of wheat flour or starch ; and it effects this without in any way altering the qualities of the material, or, like corrosive sublimate and similar agents formerly used for preserving paste, introducing anything injurious to the photograph. If a few drops of a 10-grain solution of carbolic acid be added to paste or glue when prepared for use, no fear of change or putrefaction need bo entertained, as it at once destroys the germs upon which fermentation and decompo sition depend. If glue be used it should be tested at the outset for acidity, and a little ammonia added if any trace of acid be present. Most samples of glue and gelatine in the market are more or less acid; the only article of the kind which we have reason to believe to be free from acid is a fine sample of glue prepared by a special process by Bevingtons, of Bermondsey, which doubtless might be brought into the market which supplies photographers, if the demand were created for it. A NOVEL HINT FOR DOUBLE PRINTING. The charming card pictures of Mr. Edge, especially those with a natural pictorial background, printed from a separate negative, have given rise to a considerable amount of specu lation as to their mode of production, and various ingenious theories have been advanced as to how such effects might be produced. Whether Air. Edge has some secret method of working, or whether the result is due to the skilful appli cation of known methods, we cannot say. In answer to an inquiry on the subject, Air. Edge stated that his method could not well be described in writing, but requires to be seen to be properly understood. We published a few weeks ago some excellent suggestions from a correspondent as to the best mode of producing similar effects. We now append a letter from a correspondent in Guernsey, which contains an exceedingly ingenious suggestion for a mode of obtain ing accurate masks to aid in double printing wherever delicate and careful joining is required. We will print this letter and then add one or two observations on it. Dear Sir, — Do you think that pictures might bo produced by the following method, similar to those of Mr. Edge ?— 1st. Let the portrait bo taken with any suitable fore ground, but the background must bo very light in colour. 2nd. Let a view be taken from nature, or otherwise, upon a dry plate, and, before developing, print the portrait, fore ground, &c., upon it, to such an extent as will form a mask, which will, of course, be of the exact form and shape of both figure and foreground, while the part intended to be used as a background will be protected by the light back ground of the portrait negative, according to its intensity. It may be necessary to retouch the high lights through which the light has not been able to penetrate. Great care will be required in fitting the paper upon the second negative after having printed from the first. I have not had the pleasure of seeing any of Mr. Edge’s pictures, but from what I have read in the News this appears to me to bo the best way to do pictures of that description.—Yours faithfully, N. 0. MnQuAXD. Pauvert Street, Guernsey, Dec. 30, 1867. The hint here given appears to be an admirable sugges tion for the production of masks. The most careful scissor's- work in following the undulations of a fine outline must at times fail; but here wo have a means of printing a mask of the figure on the background negative itself. The dry plate containing a latent image, either of natural scenery taken direct from nature, if convenient, or from a trans parency taken from an ordinary landscape negative, or otherwise, as may be desired, is still sensitive to light, and when ths portrait negative is superposed upon it and exposed to light it will receive another image. The light background, representing the part to be subsequently filled up with a landscape, is in the portrait negative sufficiently dense to protect that part of landscape from further action of light. When the dry plate is developed the landscape will come out without change where it has been protected from light; but where the figure in the negative has permitted the light to pass through, there will be a dense deposit from the double action of light super-imposing one image on another. Where it is insufficiently dense it will be easy to touch upon it with black paint or black varnish, the great difficulty of getting a perfect outline having been already overcome. A perfect mask so obtained, the manipulations in double printing are then reduced to simple matter of mechanical skill and care. THE OLD TONING BATH OF HYPOSULPHITE OF SODA AND GOLD. The prevalence of faded prints during late years has led to the not unfrequent enquiry, Have we really gained any thing in permanency by adopting the alkaline toning system ? And there have been some high authorities—Mr.
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