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If this second bath of binoxide of barium does not produce the requisite whiteness, it is introduced into a solution of permanganic acid or permanganate of magnesia before the last washing.

Manganese forms two unstable acids, namely, manganic acid and permanganic acid.

Permanganic acid and the permanganates.

When carbon dioxide is passed through a solution of a manganate a part of the manganese is changed into manganese dioxide, while the remainder forms a salt of the unstable acid HMnO4, called permanganic acid.

"Permanganate" required 18.8 " 18.9 " 18.8 " 18.8 " The only effect of the increase in quantity of acid was to give the brown of perchloride of manganese instead of the pink of permanganic acid to mark the finishing point.