Quote Originally Posted by Early Riser
I use Ilford Hypam, it's a rapid fixer, different from Ilford Rapid Fix. I think IRF may have some hardner added, not certain, but Hypam serves the same purpose, it's also a good deal cheaper than IRF.
Ilford Rapid Fix contains no Hardener. From The IRF MSDS the list of ingredients is:
Sodium Sulfite
Acetic Acid
Ammonium Thiosulfate

Clearly, No hardener is listed in the IRF MSDS

In addition Ilford, state:
1. The current version of Hypam Fixer is rebadged Ilford Rapid Fixer
2. There is no hardener in either IRF or Hypam - if you want hardener you must add it yourself.