New Invisible Ink

C. Wideman communicates a new method of making an

invisible ink to Die Natur. To make the writing or drawing appear

which has been made upon paper it is sufficient to dip it in water. On

drying the traces disappear again, and reappear again at each

succeeding immersion. The ink is made by intimately mixing Linseed Oil

one part. Water of Ammonia twenty parts, Water 100 parts. The mixture

must be agitated each time before the pen is dipped into it, as a

little of the oil may separate and float on top, which would, of

course, leave an oily stain upon the paper.

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