Fig. 2
From: Iron acetate solution prepared from steel wool and vinegar for ebonizing wood
Liquid portion (supernatant) of a 4-day reaction mixture of aged Rhodes steel wool and DW vinegar: a colorless reaction solution not treated further; b with added NaOH (enough to neutralize half of the acetic acid in the vinegar), green precipitates of presumably ferrous hydroxide and green rust I form; c with added NaOH, shaken, and allowed to stand for 2 min, ferric ion forms, producing a yellow–orange color; d with added NaOH, shaken, and some Fe(III) chloride added, the dark red complex is likely formed. e Dark red–brown liquid portion (supernatant) of a 14-day reaction mixture of aged Rhodes steel wool and DW vinegar, containing red-colored basic iron acetate