Headache from Fixer Fumes?

[LabRat]

Thanks for the formula, Richard. My main developer is DS-10. Anyway, whats the advantage of adding the sulfite and metabisulfite? I've been using straight Ammonium Thiosulfate for decades, and I haven't noticed any problems.

The straight ammonium thiosulfate will clear, but not at the optimum pH for long life, at not the pH for adding hardener... Someone I know was using it straight, but developed problems with incomplete fixing with films and prints picking up pink or blue casts and fading over time... Sodium sulfite + acetic acid become sulfuric acid that is not affected by developer carryover...

For the vent, anything that can draw the air over the tray out will be a big plus, and an input vent that can equalize pressure in the room is good...

Steve K