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To Keep Ink from Thickening

written with black ink, while the same influ- The only way to keep writing ink thin with ences tend to deepen and increase the color which we are acquainted is to protect it from of the Prussian blue ink. This ink is only the atmosphere. The air not only evaporates affected by continued exposure to light, which it, but oxidizes it and renders it thick. Those makes it fade in some degree; but it comsome degree; but it comink-stands which have a tapering funnel in the mouth will preserve the ink in its normal state much longer than the ordinary kind, because less of the surface is exposed. pletely recovers its original depth of color by being put in a dark place.