Potential connection between the sulfur gap and the disappearance of H₂S from interstellar ices with the formation of polysulfanes in Barnard 1b (left side) and IC 348 (right side). On each side, the top panel shows the sulfur gap between the sulfur abundances S_H2S and S_CH3OH, required to fit the observations of H₂S and CH₃OH, respectively (see also Fig. 14). The bottom panel show the projection along the line of sight of the total icy H₂S₃ abundance in the most optimistic case, i.e., assuming the sulfur abundance S_CH3OH. The chosen binding energies were those of Model 1 in Table 8.