$10S+12OH^-→5S^{2-}+2S_2 O_3^{2-}+6H_2 O$

$6S+8 OH^-→4S^{2-}+S_2 O_3^{2-}+4H_2 O$

$5S+10OH^-→S^{2-}+2S_2 O_3^{2-}+4H_2 O$