For to make a water that will take out incontinent letters from the Paper. Ye shall take a pound of blewe vitrioll, three pound of salt peter, and four unces of Vermillion and fyve pounde of Alome, and stampe them all together, and make thereof a pouder, & stille it in some vessell of glasse with a small fire, & there will come out two manner of waters the first white, & the second greene. If you take a little of the first & laie it upon the lefe of Paper written, rubbing it with a greene clothe somewhat course or roughe, it will take away the letters from the Paper, & leave it as white as yf there had never bene incke upon it.
The Second Part of the Secretes of Maister Alexis of Piemont
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