Abstract N-(1, 3-dimethylbutyl)-N′-phenyl-p-phenylenediamine (6PPD) is a globally
ubiquitous tire rubber antioxidant. Its transformation product, 6PPD-quinone, has been …

The demand for green and non-toxic hair dyes has continued to grow in recent years as the
majority of consumers prefer natural and healthy products. There are a series of pigments in …

The increasing demand for natural and safer alternatives to traditional hair dyes has led to
the investigation of nanomaterials as potential candidates for hair coloring applications …

Both nitrophenol wastewater and aromatic amine industrial waste residue are serious
threats to our environment. In this paper, N-rich porous carbons (NPC) derived from …

The increasing use of cosmetics has raised widespread concerns regarding their
ingredients. Cysteamine hydrochloride (CSH) is a newly identified allergenic component in …

Most permanent hair dyes include the hair color precursor para-phenylenediamine (PPD). It
is also, regrettably, a well-recognized powerful contact allergen that, when exposed to the …

Hair dye products include a range of chemicals, depending on the type and color. A
common primary intermediate compound used to achieve the permanent effect of hair dye is …

Abstract 2, 4, 5, 6-Tetraaminopyrimidine sulfate (TAPS) is worldwide the most commonly
used developer in hair dyes. As skin is the major organ, which is directly exposed to these …

Para-phenylenediamine (PPD) is a chemical that is widely used in hair dyes. Multiple safety
and regulatory agencies have categorized PPD as a potent sensitizer. In addition, PPD has …

Paraphenylenediamine (PPD) is one of the main ingredients used in permanent hair dyes. It
is, however, known to cause allergic contact dermatitis and potentially serious systemic …