p-Phenylenediamine, the allergen of the year? Why now? Granted, p-phenylenediamine (PPD) has been the leading permanent hair coloring agent or oxidative hair dye in most of the Western world since ...

The best way to figure out the “permanence” level of a dye is to look for indicators from the brand. Terms like ”subtle ...

No patients reacted to pyrogallol or p-phenylenediamine in lanolin. Importantly, all three of these antioxidants are known contact allergens. To our knowledge, these antioxidants have not been ...

Q: People shouldn't color hair because hair dye is carcinogenic? A: Hair dye contains "p-phenylenediamine", a chemical substance that may pose a certain risk of cancer only with frequent and ...

The brand's commitment to health and sensitivity is evident in its formulations, which eschew ammonia, resorcinol, and ...

Try to show that a connection exists, using real data going back to 1948. For your results to be publishable in an academic journal, you’ll need to prove that they are “statistically significant” by ...

The difference in chemical shift value between the peaks was 0.011 p.p.m., which was larger than ... which use DiSXDA and m-phenylenediamine for repeating structural unit, where the Tg value ...

A company's statement of income is often called its profit and loss statement (P&L). It lists revenues, expenses, and net profit for the period covered. There are typically quarterly and annual P ...

Then Heidi interviews Sr. Elizabeth Johnson. With Earth Day right around the corner, Daniel P. Horan discusses the final book by the late Catholic French philosopher and social scientist Bruno ...

The Color Purple star Taraji P. Henson will be this year’s host, with Michael J. Fox set to receive the annual Time Impact Award. The Time100: The World’s Most Influential People special will ...