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The photographic news
- Bandzählung
- 6.1862
- Erscheinungsdatum
- 1862
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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. 187, April 4, 1862
- Digitalisat
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Zeitschrift
The photographic news
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Band 6.1862
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- Register Index 619
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Band 6.1862
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, 1861 THE PHOTOGRAPHIC NEWS. Vol. VI. No. 187.—April 4, 1862. ipon a fr . hackgrot) r four fee’ rtant to of texture’ so longs’ e to keep ommend 1 BROMIDES IN INSTANTANEOUS COLLODION. brol over an in. ! 1,J under V Chalk "Where theories differ, practice must decide. For along 1 is in c ill be ablk has the re and Roue ever to n’ ything of* is the res 11 atedly b f ourfo" hat inteb' ilson for ns is bes, antages, includy for it " ■ing eftic lys be d o not al") est his used ased b! " nee ju5 ( the rede) ' deposit < ent? So ered qe feet vi" with It ctt",f for es preser" iresceb' clear , c acid, ,4 ■ will C rmula y ny esPf an inti r for. y. Po, aTe remained steadily faithful to their first love, and be- a j ' vuly in the advantages of simply iodized collodion d Pyrogallic acid development. Mr. Hardwich very tar- “ty acknowleged the value of bromides, and never recog- tized their accelerating agency. Mr. Sutton has recently maintained, with steady iteration, that with pure chemicals Imply iodized collodion, with pyrogallic acid developer, is "ore sensitive than bromo-iodized collodion with iron deve- "Went. For our own part, as our readers know, we have Always maintained, that whilst under good conditions very e pictures might be obtained with moderate rapidity with pimple iodide and pyrogallic development, these condi- tions were not always easy to secure, as depending upon Ginses beyond the operator’s control; and were uncertain and ttticult to maintain: whilst with a bromo-iodide and iron “evelopment equal, or better results, could be obtained in M conditions, without the same risk of failure when the Conditions were less favourable. ise fto®3 Over 0 mils; F n evil." nly de gative " id the 0 t a tepr y with!) reasin5/ s not" ■vil! d Ur. FP ) office",, lives. ‘ 8 ng so .b meani1< le tube etweell eache '0 hot,, the aldl ed air P articles, t is dil 'he nuly ints olo ainsab Knowing Mr. Sutton to be a careful experimentalist, and a first-rate practical photographer, we oppose our own expe- Tlence and conclusions to his with considerable deference, ithough without hesitation. As possessing far more weight, "O%ever, than the most carefully conducted experiments, we Pint to the practice of every photographer who has ac- ired any celebrity for instantaneous productions. Success "these operations can only be the result of very carefully Krnered experience, gained in actual practice: and prac- " a l men, who have bread to win as well as laurels, may kelerally be trusted and followed in their selection of Npl and manipulations. Mr. Wilson, of Aberdeen, j?' Blanchard, Major Webster Gordon, Dages and Harman, q ■ Samuel Fry, and others, whose instantaneous photo- Ss the public arc familiar with, all, without exception, eayighly bromized collodion, as we have from time to time to "ined in these pages. We can now add another name j[ C Bame list. sive ' England, whose experience is, perhaps, more exten- and ind varied than that of any photographer of the day, eentyhose process has hitherto been unpublished, has re- an y communicated to us many particulars of his formul son °Perations. Mr. England’s experience exceeds that of hi, 6 of his compeers, inasmuch as it has been more varied, a Practice having been on the Continent and in America, * as in this country. His instantaneous street scenes pus4ris, we hesitate not to say, are unrivalled for delicacy, -halt harmony, perfect instantaneity, and freedom from theY under-exposure. His views of Niagara partake of Mr pme characteristics, as regards softness and rapidity, mi • 8land habitually uses a greater proportion of bro- i ls c . in his collodion than any photographer we know. His of b Collodion for instantaneous work contains three grains niumomide of cadmium and three grains of iodide of ammo- great to each ounce of collodion. If the subjects present he th Contrast, and there is risk of producing a hard picture, J and rd increases the proportion of bromide to four grains, ing hi c68 the iodide to two grains. His mode of prepar- useAsscollodion 80 as to be able at a moment's notice to and brmPle containing any desired proportion of the iodides omides i s very convenient. With pyroxylinc made at cmov tme past the value of bromides in collodion and iron deve- uar,,« opment have been gradually obtaining recognition amongst andacd Phiotographers. There have always been, however, some who I’ )0rs Dire Demaine teedil- fithf1 - thein firet lov ond he ig.space” anj _ nly ply iodized . Hardwich a moderately high temperature, and five parts of ether and three of alcohol, or sometimes equal proportions, he makes a normal collodion, adding just sufficient of the cotton to give a good film. One lot of this collodion has bromide of cad mium at the rate of 24 grains to the oz. added to it; another lot has iodide of ammonium in the same proportion added. With a bottle of each of these, properly settled and decanted, and a bottle of the normal collodion',, a collodion ready for use at a minute’s notice with any pzoportion of iodides and bromides may be produced. A drachm of each, containing the iodide and the bromide, to six drachms of the normal collodion, gives the proportion generally used for instan taneous work. The advantage of having the iodide and bromide dissolved in collodion instead of in alcohol as is customary, is, that there is no difficulty or doubt about altering the thickness by dilution, and the collodion is ready for use at once, without any fear of turbidity or precipitation, which sometimes occurs when alcoholic solutions of sensitizing salts are added to collodion. Mr.England has a profound faith, based upon experience, in the action of bromides in acce lerating, and in producing harmonious negatives with short exposure. Accordingly, in proportion to the amount of rapidity required, or the amount of contrast in the subjects endangering hardness, an increased proportion of bromide is added. Mr. England excites in a bath of pure silver as nearly neutral as possible, and develops with a strong solution of iron, varying the strength of the developer with the subject and the proportion of bromide, from twenty-five grains to fifty grains to the ounce of water. He frequently obtains the desired vigour with this alone ; but sometimes intensifies with pyrogallic acid and silver. In all the formula of successful professional photographers engaged in instantaneous work, a very large proportion of bromide is present; whilst wc do not know one engaged professionally in this branch of our art who uses a simple iodide and pyrogallic acid development. We may mention, as strikingly similar to Mr. England’s practice, although ar rived at by independent experience, and without any con cert or comparison of notes, that Mr. Blanchard returned a few weeks ago from a successful trip in pursuit of instan taneous photography, in which he informed us that he used five grains of bromide to four of iodide in his collodion. We may remark that with professional photographers under such circumstances, it is not a photographic tour de force, secured by a chance plate, that is aimed at. This was a journey many score of miles, taken expressly, in the early part of the gloomy month of March, to secure a series of in stantaneous negatives of scenes in the restless bustle and hubbub of a country fair ; and notwithstanding the season and weather the pictures were obtained. We have another word to say on iron negatives, in regard to the proper quality of which we fear there is some mis apprehension amongst some of our readers, and we must add either in the mind or in the language of our good friend Mr. Sutton. He has frequently recently spoken of “ the flat, veiled, iron developed negatives,” as though iron nega tives were necessarily of this character. “ A good pyro developed negative is certainly much pleasanter to print from than a flat, fogged, grey negative, developed with iron,” he says in the last Notes. This is unquestionably true; but it is just as true that a good iron developed nega tive is more pleasant to print from than a flat, fogged, grey negative, developed with pyro. A good negative is always more pleasant to print from than a bad one, no matter how
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