  It is generally believed that sulfur hydride under high pressure is a high
temperature superconductor. In National Science Review 6, 713 (2019) Huang and
coworkers reported detection of superconductivity in sulfur hydride through a
highly sensitive ac magnetic susceptibility technique and an unambiguous
determination of the superconducting phase diagram. In this paper we present
evidence showing that the experimental results reported in that paper do not
support the conclusion that sulfur hydride is a superconductor.
