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Message: <blockquote data-quote="piperbarb" data-source="post: 300164" data-attributes="member: 12214"><p>Could he have rigged it so that the stop bath, which is glacial acetic acid (5% acetic acid by volume is vinegar) would mix with common bleach?  That would cause a very nasty reaction and some rather caustic products.  It would cause the sodium hypochlorite in the bleach to become hypochlorous acid.  If one gets the pH low enough, it would form chlorine gas - some very nasty stuff.    Taking off my chemistry hat.  I have to do something with my degree, you know.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>