Page 1/21 Heavy Metals and Para-Phenylenediamine in Hair Dye Randa H Abdelhady Assiut University Faculty of Medicine heba A yassa (  hebayassa@aun.edu.eg ) assiut university https://orcid.org/0000-0001-9239-7049 Marwa M Mahmoud Aswan University Eman S Shaltout Assiut University Faculty of Medicine Research Article Keywords: Hair Dyes, PPD, HMs, GC/MS and EDX. Posted Date: November 12th, 2021 DOI: https://doi.org/10.21203/rs.3.rs-956465/v1 License:   This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License