Does More PPD Mean More Colour?
It was found that dyes with a higher PPD content (high dye ready to use) showed slight fading to prominent fading in the lab s performance test, while dyes with less PPD also performed well. However, in liquid hair dyes it was observed that dyes with a higher PPD content and active dye content performed better. So as is confusing to consumers, so was it for our scientists as no direct corelationship could be established between dye content and colour fastness. How Safe Are Dyes? Therefore, it appears that apart from the PPD, other ingredients, the formulation, the manufacturing process, etc., also play a role in the overall performance of hair dyes. At the same time, many questions have primarily been raised about the safety of using hair dye. Besides allergies, hair dye has come under scrutiny in recent years due to a possible link to various types of cancer. Although not all experts agree, many believe that a leading cause of hair colour allergic reactions are related to the PPD. Oth
