Scientific American Supplement, No. 623, December 10, 1887 by Various


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Page 22

_Clear Red Brown._
6.--Citric acid. 120 grains.
Carbonate of magnesia. 76 "

_Warm Gray Brown._
7.--Citric acid. 120 grains.
Carbonate of soda. 205 "

_Deep Red Brown._
8.--Citric acid. 120 grains.
Carbonate of potash. 117 "

_Green Blue._
9.--Citric acid. 90 grains.
Carbonate of soda. 154 "
Citrate of potash. 24 "
Oxalate of potash. 6 "

_Sepia Red._
10.--Citric acid. 80 grains.
Carbonate of soda. 135 "
Citrate of potash. 12 "
Oxalate of potash. 3 "

11.--Citric acid. 108 grains.
Carbonate of magnesia. 68 "
Carbonate of potash. 12 "
Oxalate of potash. 3 "

_Sepia Yellow._
12.--Citric acid. 40 grains.
Carbonate of magnesia. 25 "
Citrate of ammonia. 166 "

13.--Citric acid. 120 grains.
Carbonate of magnesia. 72 "
Carbonate of ammonia. 72 "
Chloride of sodium. 8 "

_Blue Black._
14.--Citric acid. 120 grains.
Carbonate of ammonia. 70 "
Carbonate of magnesia. 15 "

15.--Citric acid. 120 grains.
Carbonate of magnesia. 38 "
Carbonate of ammonia. 44 "

16.--Citric acid. 90 grains.
Carbonate of magnesia. 57 "
Citrate of potash. 54 "
Oxlate of potash. 18 "

17.--Citric acid. 72 grains.
Carbonate of magnesia. 45 "
Citrate of potash. 54 "
Oxalate of potash. 18 "

18.--Citric acid. 60 grains.
Carbonate of magnesia. 38 "
Citrate of potash. 68 "
Oxalate of potash. 22 "

_A more Intense Blue Black._
19.--Citric acid. 30 grains.
Carbonate of magnesia. 18 "
Citrate of potash. 100 "
Oxalate of potash. 33 "

_A Clearer Blue._
20.--Citrate of potash. 136 grains.
Oxalate of potash. 44 "

In the photographic exhibition at Florence, the firm of Corvan[1]
places on view a frame containing twenty proofs produced by the
foregoing twenty formul�, in such a way that the observer can compare
the value of each tone and select that which pleases him best.--_Le
Moniteur de la Photographie, translated by British Jour. of Photo._

[Footnote 1: Does this mean Mr. A. Cowan?--_Translator._]

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Books | Photos | Paul Mutton | Sun 21st Dec 2025, 9:41