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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. 501, April 9, 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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April 9, 1868.] THE PHOTOGRAPHIC NEWS. 179 (illustrating the work of Messrs. Fergusson and Hope) were taken by Colonel Biggs, R.A. ; and, I believe, he received a medal, at the Paris Exhibition, for the pictures in question.— I am, dear sir, yours truly, A. W. HOstER. Plymouth, April 6th, 1868. KEEPING PROPERTIES OF TANNIN PLATES. Sib,—As photographers will now be making arrangements for the ensuing season, I send the following particulars, show ing the keeping qualities of the plates prepared by the tannin dry process. On the 9th of June, 1866, the plates were pre pared: on the 30th March, 1868 (nearly twenty-one months after the plate was prepared), I took the negative, from which a print is sent herewith. The exposure was six minutes and a half; the day clear and bright. The minute particulars on the walls and thatch, the shadow on the dial, and even the stones and glass in the gable of a house on the opposite side of the churchyard, come out as clearly as on a freshly made plate. The experiment has been made also with a stereographic plate, prepared at the same time, and with equal success. The collodion was Ponting’s bromo-iodized, newly made; the glasses received no preliminary coating; the bath, that used for his wet collodion ; the preservative, 15 grains of tannin and ± drachm of methylated spirit to 1 ounce of water ; deve loper, a solution of pyrogallic acid and absolute alcohol, mixed with nitrate of silver, citric acid, and water, at the time of developing. The picture did not start out, but developed gradually; and this is the only difference between this and a freshly made negative. The plates have been kept in a com mon white wood box with grooves, placed in a drawer in a room in constant use, so that they were kept dry. The lens was one of Grubb's aplanatic, two inches diameter. I have thought it right to trouble you with the above parti culars, as they may bo important to travellers, showing, as they do, the value of tannin plates to persons on long journeys, or in wild districts, in cases when an instantaneous photograph is not required. I have now used this process for more than six years (the plates I prepare myself), and though it may be slower than others, it is more sure ; out of twelve plates 1 count on eleven negatives with certainty, and generally have the whole dozen.—Yours truly, G. W. 0. April 5th, 1868. [The print enclosed by our correspondent is clean and bright, showing, perhaps, a trace of under-exposure in lack of detail in deep green foliage and in the dusky non-actinic trunk of a tree. It is a striking illustration of the keeping qualities of the plates.—Ed.] CLEANING VARNISHED PLATES. Sir,—I see in a recent News a method for cleaning old varnished negatives. I have used the following for years with perfect success :—Sulphuric acid (say) three parts, and nitric acid one part; mix in a saucer a small quantity, and apply with a clean rag to the varnished side, then the other side and edges all the plates to be coated; put them in a pan or other earthenware vessel; pile them up one over the other, so as to lot the back of one plate come in contact with the face of the other; let them remain a few hours, then cover them with water ; let thorn soak a day or two or more, changing the water a few times to get rid of the acids ; rinse thoroughly in A couple of waters, and the plates are perfectly clean. A bucket of water should be provided beforehand, to wash the hands occasionally when coming in contact with the acids. Acids, after making pyroxyline, will answer the same pur pose by immersing the old plates in a dish.—Very respectfully fours, C. R. Lobb. Wadebridge, March 66th, 1868. Ulk in the Studig. pSorA Enlargements on Canvas.—A correspondent of the Philadelphia Photographer gives the following details by which e states that fine results can be obtained:—“ First prepare the canvas with a very thin solution of negative varnish, then coat it with albumen prepared as follows :— Albumen ... 10 ounces Iodide of potassium 200 grains Liquid honey 2 ounces. Beat to a stiff froth, and let settle; coat the canvas with th above in the following manner : —Pour a small quantity on the canvas, and with a broad varnisl-brush carefully cover the whole surface (avoiding bubbles as much as possible), then pour a larger quantity of the albumen on, and float the canvas freely, and let it drain back into the dish. When dry it is ready for use. It is silvered as followsTake a solution of plain silver 30 grains strong, acidified with acetic acid 10 drops to the ounce, and flow it over the canvas in the dark ; shake lively until the canvas has a smooth, clean look, then print, while wet, deep enough to make the image quite plain. Then develop with a saturated solution of gallic acid ; wash well, and fix with soda 2 ounces, water 10 ounces. When fixed, wash thoroughly ; and when dry, varnish with a very thin coat of negative varnish, and it is ready for the artist. Although with the above process I have made and sold a great many pictures of that kind, I prefer (and so does every good oil painter) to make a sketch through a carefully made transparent positive. In putting a photograph on canvas by any process, it alters the condition or consistency of the canvas surface so much that it is very diffi cult to preserve the purity and harmony of colours.” Another Method of Enlarging on Canvas.—W. M. Gardner also gives the foliowingas an excellent method:— “ First prepare the canvas. Rub it with pulverized pumice- stone, then make a paste of China clay and water, and coat it. When dry wash off, and, while wet, pour on a solution of 50 grains of bromide of potassium, 10 grains of water, 5 grains of cyanide of potassium, and set it aside to dry. When dry silver it with a solution of 30 grains of nitrate of silver, 1 ounce of water, ± ounce of acetic acid No. 8, and print while wet. Fix in a weak solution of hyposulphite of soda, and it is ready for the artist. This process is for solar camera printing ; or, if wanted to print by contact, prepare the canvas the same way. Salt the same as plain paper, and silver it with a 40-grain silver solution, and tone and fix as usual. This process I have used for years, and have not had any fault to find with it.” Collodion giving Intensity.—A correspondent writes:— “ In August last you gave, iu Photographic News, formula for iodizing plain collodion, which formula is, I see, repeated in the new Year-Book, page 78. I have just tried 74 ounces of plain collodion which I so iodized about six months ago, and am much pleased with the result; the chief feature being greater resistance to the light in printing, enabling me in some cases to do without any redevelopment. I coated a plate half with the above, and half with an ordinary sample, and the difference iu favour of that treated as you recommend is very great.” Utilizing Old Negative Baths.—The same correspon dent says :—“ In respect of old baths, I have always used them up by neutralizing with com. soda at a rather high temperature, and boiling down to 60 grains sol. Used for printing, such a bath, with addition of sugar a la Bovey, gives very rich tones, of a maroon tint.” International Copyright with America.—We men tioned a few weeks ago that a Bill for International Copyright with this country had been introduced into the House of Representatives, U. S., and expressed a hope that works of fine art would be included. The American correspondent of a daily contemporary says :—“ Frightened by the petitions from the friends and opponents of an International Copyright Law, the joint committee on the library has ‘ come to an informal understanding ’ to postpone indefinitely action on the Bills already referred from the Senate and House. A long farewell to international copyright 1” Old Baths.—Acorrespondent,Mr. C.R. Lobb, of Wadebridge, sends us the following:—“A simple way ofevaporatingold nega tive baths todryness is to put the evaporating-dish in the kitchen stove on a little sand, open the door every ten or twenty minutes to let out the steam until evaporated to perfect dryness, and let it slowly cool; leave it a few hours, and the silver will part from the basin, and can be removed quite easy. I find the above plan more rapid and much less trouble than the sand-bath. I quite agree with all that has been said: the silver is quite equal, if not superior, to new, for making a bath. The last few days I have been trying the silver for printing
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