adding sodium sulfite to developer

Someone mentioned once that they added sodium sulfite (maybe sulfate)to their developer and was able to increase development time. Does anyone know why increasing development time would be advantageous and if adding this chemical is useful. I think that it slows down oxidation (not sure). In particular I use HC110 (B) diluted 1:14 for 10 min at 68 deg. thanks for any input. carol

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