Manganese Blue
:
ON THE PRIMARY, BLUE.
An aqueous solution of permanganate of potash yields with baryta-water a
violet mixture, which afterwards becomes colourless, and deposits a blue
precipitate. This retains its colour after washing and drying, but
cannot be recommended as a pigment, being liable to suffer in contact
with organic substances, which deoxidize and decolourize the manganates
and permanganates.