I think there may have been residual sodium hypochlorite from when I last bleached the tiles. Voila, instant chlorine generator.
Got another quack appointment in 20 minutes, see how things are. All seems repairing very well. Thankfully, never did have burning eyes etc, so escaped that nastiness.
My great grandfather was gassed in WW1 (I know, mustard gas is sulphur and chlorine, but kinda similar) and suffered for the rest of his life with pulmonary problems, succumbing to pneumonia after WW2. I can imagine now just how wretched, inhumane a way to die it was!
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