[18] For the damaging effect of tannin-laden ingredients mixed with substances containing iron, see, for example, Buss, “Very Fine Black”, 110; and Ortega-Saez, “Black Dyed Wool”, 73.
[18] For the damaging effect of tannin-laden ingredients mixed with substances containing iron, see, for example, Buss, “Very Fine Black”, 110; and Ortega-Saez, “Black Dyed Wool”, 73.