As with every other acid, however, it still produces emissions when it comes in to contact with a carbon-alkaline, sulfite-containing developer.
Almost all paper developers contain a large amount of sodium sulfite to prevent oxidation; if you want to completely prevent the emissions caused when this comes into contact with a stop bath, you can use a water bath in place of a stop bath. However, it should be noted that without the abrupt change in pH-value from the acidic stop bath, the developing process will continue, albeit much more slowly.
NEW! - Even better formulation!
The above-mentioned SO-2 emission is now unnoticeable, even for sensitive noses. Dilution to a 2% solution (1+28, or 36ml per liter water), but a dilution of 1+40 is fully sufficient to stop the developing process.
Time: 15-30 seconds