Quote Originally Posted by Ian Grant View Post
The old way of making rapid fixer was to use Ammonium Chloride and Sodium Thiosulphate, however as large manufacturers switched to rapid fixers the price of ammonium thiosulpate dropped.

So you could use Ammonium Thiosulphate instead (and no ammonium chloride).
One of the reasons I particularly like OF1 is that it uses the chloride which I can get shipped in solid form, whereas the amm. thio. in these parts is liquid and no-one will ship it to me. As such this makes it a rapid alkaline fixer which plays well with catechol and I can home brew. Furpect