manganic

Manganic acid cannot be formed because of its rapid disproportionation.

On exposure to the air, ferric and manganic hydroxides are formed as flocculent solids.

These colors are due to the accumulation of ferric hydroxide and manganic oxide deposited with the mucilage and minerals that comprise the lorica.

The commonest method is simple aeration of the water, which oxidizes the ferrous or manganese salt and gives a precipitate of ferric or manganic hydroxide.