Alexander the Oracle-monger (21)

Perhaps you will ask what these contrivances were; well, then—the information may be useful another time. One of them was this. He would heat a needle, melt with it the under part of the wax, lift the seal off, and after reading warm the wax once more with the needle—both that below the thread and that which formed the actual seal—and re-unite the two without difficulty. Another method employed the substance called collyrium; this is a preparation of Bruttian pitch, bitumen, pounded glass, wax, and mastich. He kneaded the whole into collyrium, heated it, placed it on the seal, previously moistened with his tongue, and so took a mould. This soon hardened; he simply opened, read, replaced the wax, and reproduced an excellent imitation of the original seal as from an engraved stone. One more I will giveyou. Adding some gypsum to the glue used in book-binding he produced a sort of wax, which was applied still wet to the seal, and on being taken off solidified at once and provided a matrix harder than horn, or even iron. There are plenty of other devices for the purpose, to rehearse which would seem like airing one’s knowledge. Moreover, in your excellent pamphlets against the magians (most useful and instructive reading they are) you have yourself collected enough of them—many more than those I have mentioned.