I've never heard this term used - but it is apparently what in the UK is
called Etch-bleaching, in this case followed by redevelopment. Another
alternative is to fix the print and dye the remaining gelatin to give a
coloured image.
A UK company (their name escapes me at the moment) used to produce various
coloured base papers for use with this, as well as selling the chemistry -
though it was easy to mix your own - from memory almost any mixture of a
copper(II) solution(such as copper sulphate) and hydrogen peroxide performed
the etching stage. It needs to be used warm to hot. You save money by using
less copper sulphate!
In the past my students have played a lot with the various variations of
this - with success on various types of RC paper. Considerable rubbing of
the surface in the etch bath using cotton wool is sometimes needed to remove
the gelatin.
There was also a kit from Tetenal that did the same thing though much more
expensively.
Peter Marshall
On Fixing Shadows, Dragonfire and elsewhere:
http://faraday.clas.virginia.edu/~ds8s/
Family Pictures & Gay Pride: http://www.dragonfire.net/~gallery/