G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 31/22 (2006.01) G01N 21/78 (2006.01)
Patent
CA 2132413
A sheet of paper is impregnated with a fluorescein-based dye and a strong organic acid together with a humectant In the presence of the strong organic acid, the normally colored fluorescein-based dye remains colorless on the paper. When a basic gas dissolved in the moisture held by the humectant turns the pH of the paper to the alkaline side, fluorescein-based dye takes on color in accordance with the hydrogen ion concentration. The concentration of the basic gas can be determined by measuring the degree of this coloration.
Nakano Nobuo
Riches Mckenzie & Herbert Llp
Riken Keiki Co. Ltd.
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