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1 "Ærugo." The researches of modern chemists have ascertained the composition of verdigris to be a diacetete of copper; the sesquibasic acetate and the triacetate are also to be considered as varieties of this substance; we have an exact analysis of these salts in the "Elements" of the late Dr. Turner, the Sixth Edition, edited by Professor Liebig and Mr. W. Turner, pp. 931, 2. Most of the processes described in this Chapter are mentioned by Dioscorides.—B. See also Beckmann, Hist. Inv. Vol. I. p. 171, et seq., Bohn's Edition.
2 According to Brotero, this is the process generally adopted in France, in preference to the employment of vinegar in a pure state.—B.
3 The form of copper which was termed "coronarium" has been already described in Chapter 22.—B.
4 "Atramento sutorio." "Shoemakers' black." See Chapters 27 and 32 of this Book.
5 Until it assumes an ashy colour, Dioscorides says.—B.
6 See B. xii. cc. 30, 32.
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