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It forms about nine tenths of the solid matter of the red corpuscles and to it is due the colors of the blood. When united with the oxygen it forms a compound, called oxyhemoglobin, which has a bright red color; the hemoglobin alone has a dark red color. These colors are the same as those of the blood as it takes on and gives off oxygen.
He pricked his finger and let a drop of blood fall into a little fresh distilled water, some of which he placed in the spectroscope. "Look through it," he said. "Blood diluted with water shows the well-known dark bands between D and E, known as the oxyhemoglobin absorption." I looked as he indicated and saw the dark bands. "Now," he went on, "I add some of this other liquid."
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