Ferrate Of Baryta
: ON THE PRIMARY, RED.
Produced by adding aqueous ferrate of potash to an excess of dilute
solutions of baryta salts, has been described as carmine-coloured and
permanent. We have not found it to be so--an experience which has
evidently not been confined to ourselves; and we cannot help thinking
that this is one of those errors which get copied from one chemical work
into another, to the special confusion of students. It is but fair,
however, to add that in Mr. Watts' Dictionary of Chemistry, the latest
and best work of the kind, this ferrate is said to become "brick-red
after washing and drying at 100 deg. C.," and to be only "tolerably stable."