Dictionarium polygraphicum. Articles added by way of supplement. An invisible ink.

Dictionarium Polygraphicum:
Or, The Whole Body of Arts Regularly Digested.
Vol II.
London: Printed for C. Hitch and C. Davis in Pater-noster Row, and S. Austen in St. Paul's Church Yard. MDCCXXXV.
The first.
Take a penny-worth of litharge of gold or silver, unprepar'd; beat it, then infuse it in a vial, half full of strong vinegar, shake them well together, and set it by to settle; and when it is clear, wire upon paper with a new pen, and it will not appear at all.

The second ink.
Burn cork till it has done smoaking, quench it in aqua-vita, or spirit of wine, and dry it, and mix it with water and a little gum-Arabick, to the consistence of thin paste; when you would write with it, make it thinner than common water, and write upon what is written with the before mentioned ink.

The third ink.
Take yellow orp'ment and quick-lime, of each an ounce; beat them and put them into four ounces ofcommon water, and this water will take away the second ink, and make what was written with the first, appear.

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