Some Important Information on How to Neutralize Bleach - but never use vinegar (and water alone will not do it).
I’ve posted this article before on neutralizing bleach here. You can use 3% hydrogen peroxide (look for it at your drug store) or a product called Bleach Stop. store. It says never to use vinegar:
Whatever you do, never use vinegar or any other acid in an attempt to neutralize your chlorine bleach. It will destroy the hypochlorite that is the active ingredient of chlorine bleach, but only by turning it into much more caustic and dangerous chemicals, including hypochlorous acid, which is very damaging to textiles, and, if the pH gets low enough, deadly chlorine gas.
This is information from the “I Tie Dye” Forum here (this forum also refers back to the above article):
The problem with vinegar is that acids react with hypochlorite to form even more caustic and deadly chlorine gas. One should never mix acid with hypochlorite, and vinegar is an acid.
However, thiosulfate is not the only chemical that will safely and completely neutralize hypochlorite bleach. Both sodium metabisulfite (ProChem’s Anti-Chlor) and hydrogen peroxide (3% solution) are just as effective and safe as thiosulfate.
DIY How to Draw on Fabrics with Bleach Gel After Dyeing Tutorial from The Crafty Chica here. *For anyone selling bleached shorts/shirts/fabric: really important information on how to fully stop the bleach from eating away at your fabric using a product called “Bleach Stop”. Also in the comment section someone recommended this link here for more info on neutralizing/deactivating bleach from dyeing (3% hydrogen peroxide is cheap and you can get it anywhere for under a $1 for a large bottle) and what to never use - vinegar.