clearly put and the drift of it is apparent we cannot give a straight-forward answer. Perhaps we do not understand J. C. F. and therefore may tell him something very wide of what he needs If writing be made with chromate of potash and after it is dry will b2come fixed and changed in color the colors produced are in water. 1866 SCIENTIFIC AMERICAN INC., 1866-06-02
clearly put and the drift of it is apparent we cannot give a straight-forward answer. Perhaps we do not understand J. C. F. and therefore may tell him something very wide of what he needs If writing be made with chromate of potash and after it is dry will b2come fixed and changed in color the colors produced are in water. 1866 SCIENTIFIC AMERICAN INC., 1866-06-02
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