Scientific American Supplement, No. 586, March 26, 1887
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The result of this bath is a brilliant brown color, what might indeed, perhaps, be best described as a red. Two out of the three prints are muchtoo dark, indicating, perhaps, that this toning bath did not have anytendency to reduce the intensity of the image.
The general lesson taught by Clark's experiments is that the sulphocyanidebath gives better results than any other. A certain proportion of theingredients--namely, that of bath No. 3--gives better results than anyother proportions tried, a...nd about as good as any that could be hoped for. Any of the ordinary alkaline toning baths may be used, but they all giveresults inferior to those got by the sulphocyanide bath. The best of theordinary baths is, however, the phosphate of soda.
And now a word as to those parts of the prints which have been treated withbichloride of mercury. The thing that strikes us as remarkable inconnection with them is that in them the image has scarcely suffered anyreduction of intensity at all. In most cases there has been a disagreeablechange of color, but it is almost entirely confined to the whites andlighter tints, which are turned to a more or less dirty yellow.
What to read after Scientific American Supplement, No. 586, March 26, 1887?
You can find similar books in the "Read Also" column, or choose other free books by Various to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The result of this bath is a brilliant brown color, what might indeed, perhaps, be best described as a red. Two out of the three prints are muchtoo dark, indicating, perhaps, that this toning bath did not have anytendency to reduce the intensity of the image.
The general lesson taught by Clark's experiments is that the sulphocyanidebath gives better results than any other. A certain proportion of theingredients--namely, that of bath No. 3--gives better results than anyother proportions tried, a...nd about as good as any that could be hoped for. Any of the ordinary alkaline toning baths may be used, but they all giveresults inferior to those got by the sulphocyanide bath. The best of theordinary baths is, however, the phosphate of soda.
And now a word as to those parts of the prints which have been treated withbichloride of mercury. The thing that strikes us as remarkable inconnection with them is that in them the image has scarcely suffered anyreduction of intensity at all. In most cases there has been a disagreeablechange of color, but it is almost entirely confined to the whites andlighter tints, which are turned to a more or less dirty yellow.
What to read after Scientific American Supplement, No. 586, March 26, 1887?
You can find similar books in the "Read Also" column, or choose other free books by Various to read onlineMoreLess
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