The Standards for Manufacturing (Importing) Approval of Hair Dyes, issued on May 14, 1991, serves as the official regulatory framework for the approval of quasi-drug hair dyes, bleaching agents, and color removers. Effective for applications filed on or after July 1, 1991, this standard mandates specific criteria for ingredient types, concentration limits, and quality specifications to ensure product efficacy and safety. Applicants are required to verify compliance with these standards in their marketing authorization submissions.