Note 7 — Chapter III
S. R. (Sylvester Rosa) Koehler translation
(p. 21.) Etching is the most individual of the reproductive arts (or rather of the multiplying arts, the German vervielfältigende Künste), even in its technical processes. Therefore nearly every etcher has his own ways of doing, and few agree on all points. Many etchers do not think it necessary to weaken the acid as described in the text. But be sure to let it cool after it has been mixed with water, before you immerse your plate!