darkroommike wrote:

Sorry meant hypo check.


HT-1 is a hypo check. So is HT-2. The two are used
to check for thorough washing out of the hypo. You have
in mind FT-1 which is the iodide test of the Fixer. ST-1 is
a test for silver left in the emulsion. Use ST-1 along with
FT-1 to be more sure of complete fixing. Dan