Anthony's photographic bulletin for .. . nd the lilti ation of the light. ithstanding the interesting results of Mr. Ivesexperiments on the sensitizationof the ordinary plate, published some time since, which seem to show that with r filtration of light photographic action may be obtained from any part of the in practice, it is necessary to make use of sensitization. The meth itization and the results it produces may be clearly stated, but no1 • explaining what the nature of the effect produced on the plate pectrum acts, generally, as a reducing agent, while, on band, the red end often shpws a
Anthony's photographic bulletin for .. . nd the lilti ation of the light. ithstanding the interesting results of Mr. Ivesexperiments on the sensitizationof the ordinary plate, published some time since, which seem to show that with r filtration of light photographic action may be obtained from any part of the in practice, it is necessary to make use of sensitization. The meth itization and the results it produces may be clearly stated, but no1 • explaining what the nature of the effect produced on the plate pectrum acts, generally, as a reducing agent, while, on band, the red end often shpws a tendency to acl as an oxidizing ag< at condition However this may be, one ot the essential propertii \ oJ o • nature, and such as to enable it to appropi late to itseli of thi red end oi the i pecti um. Another . propeiI • i iii it ii it in c, t he bo called • ual the ? i m it Izi i should absoi b onlj that being reflected, iplementat j to the color to which . i • ni and malachit* green ? < i n ? 11 i ?? e I o. Negative on Qlimax Platesy , Dayton, ohio. Halftone and Printing at the-School oi-- Practical enqravinq [89 re 1. and erythrosine and methyl violet sensitize to yellow, ete. When the kind, ex-tent and degree of sensitization are determined, the problem of filtration is quitesimple. The filter must be chosen with reference to the condition of experimenters make a serious mistake at this point by assuming that becausethe end in view is to obtain three photographs, one of the red, another of the green,and another of the violet-eolor ingredient (in the case of a lantern picture), they mustneeds use ray filters of corresponding colors. Such filters would, perhaps, be the eor-rect ones to use if there could be produced in the plate a perfectly uniform and con-tinuous sensitiveness throughout the entire visible spectrum. It is doubtful,however, if such a condition is at all desirable. Various sensitizers may be made toprodu
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectphotogr, bookyear1870
