There is no hardener in most Rapid fixers that I am aware of - unless you elect to add it.
That particular Rapid Fixer is an anomaly in the world of Rapid Fixers.Exception: https://www.bhphotovideo.com/c/prod...058452_professional_kodafix_1qt_solution.html
{Edited by Matt King, to make it easier to figure out}
Kodak Rapid Fixer, Kodak C41 Fixer, Ilford Rapid Fixer and Ilford Hypam are the Rapid Fixers that I encounter most, and I believe are used most in the markets that I am familiar with.
They are all non-hardening, unless you elect to add hardener (to the ones compatible with hardener - Ilford Rapid Fixer is not). There are other Rapid Fixers that come from other suppliers that are also quite popular, and are, as far as I am aware also non-hardening.
Most importantly though, it is not necessary to have hardener in your Rapid Fixer, unless you choose to do so.
