Background: Finding alternative hair dyes for individuals allergic to para-phenylenediamine (PPD ... was only one patient who was allergic to ortho-nitro-PPD and not to PTDS.

The method developed in this research is to synthesize carbonized polymer nanodots using ortho-phenylenediamine (oPD) and polyacrylic acid (PAA) hydrothermal synthesis. Researchers mixed some ...