1836–41 W. T. Brande (ed. 5) iii. vii. 165 The protacetate [of iron] is formed by digesting sulphuret of iron in acetic acid.
1908 31 July 145/1 These companies..utilize every part of the tree..producing such by-products as pyroligneous acid, acetic acid, protacetate of iron, [etc.].