As in the oxidizing flame.

  Behavior with Mic.  Salt on Platinum wire

    in the oxidizing flame.

      Dissolves readily to a clear glass, which, when it contains a
      large proportion of the acid, is yellow while warm, but becomes
      colorless on cooling.

    in the reducing flame.

      The glass obtained in the oxidizing flame undergoes no change,
      nor does it, according to H.  Rose, alter by the addition of
      sulphate of iron.

* * * * *

26.  Niobic Acid, Ni^{2}O{3}

  Behavior with Borax on Platinum wire

    in the oxidizing flame.

Behaves in a similar manner to tantalic acid, but the glass requires a very large dose of the acid to render it opaque under an intermittent flame.  With an increased amount of the acid, the glass is clear and yellow, while warm, but becomes on cooling turbid, and when quite cold is white.

    in the reducing flame.

The glass obtained in the oxidizing flame and which has become opalescent on cooling, is rendered clear in the reducing flame.  With a larger addition of the acid, it becomes dull, and of a bluish-grey color on cooling, and a still larger amount of renders it opaque and bluish grey.

  Behavior with Mic.  Salt on Platinum wire

    in the oxidizing flame.

      Dissolves in large quantities to a clear colorless glass.

    in the reducing flame.

If the acid be not present in too large a proportion, the glass remains unchanged.  An additional amount of the acid renders it violet, and a still larger quantity affords a beautiful pure blue color, similar to that produced by tungstic acid.  If to such a bead some sulphate of iron be added, the glass becomes blood-red.  The addition of peroxide of iron renders the glass deep yellow while warm, the color becomes paler on cooling.

* * * * *

27.  Pelopic Acid, Pp^{2}O^{3}.

  Behavior with Borax on Platinum wire

    in the oxidizing flame.

      Behaves similarly to the preceding.

    in the reducing flame.

      A bead containing sufficient of the acid to render it
      spontaneously opaque on cooling, has a greyish color.

  Behavior with Mic.  Salt on Platinum wire

    in the oxidizing flame.

      Dissolves even in large quantity to a colorless glass.

    in the reducing flame.

      With sufficient dose of the acid, the bead becomes brown with a
      violet tinge.  This reaction is readily obtained upon charcoal. 
      Sulphate of iron renders the bead blood-red.

* * * * *

28.  Oxide of Antimony, SbO^{3}.

  Behavior with Borax on Platinum wire