Para-phenylenediamine, or PPD, is a chemical compound with the formula C6H4(NH2)2. It belongs to the class of compounds known as aromatic amines, which are characterized by a ring of six carbon atoms with one or more amino groups attached.
PPD is a synthetic compound that is commonly used as a hair dye. It is also used in some types of black henna tattoos as a darkening agent. PPD is known for its fast coloring ability and high resistance to fading, which makes it a popular choice for hair dyes.
However, PPD is also a strong sensitizer, which means that it can cause an allergic reaction in some people. Symptoms of a PPD allergy may include redness, itching, swelling, and blistering at the site of the tattoo. In severe cases, an allergic reaction to PPD can cause anaphylaxis, which is a life-threatening condition that requires immediate medical attention.
Exposure to PPD can also cause other health problems, such as respiratory issues, skin irritation, and eye irritation. It is classified as a potential carcinogen (cancer-causing agent) by some regulatory agencies, although more research is needed to confirm this.
