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In the mechanical testing world, the tendency for materials to fail under a repeated stimulus is termed fatigue testing, and this article discusses this topic in relation to hair breakage. It will be shown that this alternative testing approach provides considerable insight into the cause of hair breakage, and subsequently allows for the identification of strategies for its minimization; it will also be demonstrated how learning this provides the underlying theory by which anti-breakage and even “strengthening” claims are crafted.
The Interagency Coordinating Committee on the Validation of Alternative Methods (ICCVAM) has requested the submission of new science or information on alternative test methods or testing strategies for skin sensitization, as part of a plan of action to advance this area.
Research from the University of Gothenburg has led to a potential method for identifying allergenic fragrance compounds in consumer products by exposing them to air.
The IFSCC conference covered an array of subjects—from the psychology of rotating brushes, and discussion of neuron-adipocyte crosstalk to limit emotional stress-mediated fat accumulation; to hair straightening and conditioning, various visualization tools, and novel formulation approaches.
Personal care is now dominated by want rather than need, and one facet at the crux of this trend is the taboo word of the century: wrinkles. As with the majority of cosmetic products and claims in the 21st century, product development teams aim to differentiate their products from competitors in one way or another, to create a successful brand and generate profit.
The most common approach to determine ingredient deposition on hair is to analyze the treated tresses, but this poses several challenges. Instead, the authors describe a novel approach based on determining the amount of ingredient collected in the rinse water, and back-calculating the amount deposited on hair. Development and validation efforts discussed here use polydimethylsiloxane as a model compound.
This work evaluates the impact of applied pressure during sample spreading on the in vitro measurement of UV transmission. The authors work in a range of pressures between 50–200 g and demonstrate that pressure control is a key parameter that should be strictly controlled to ensure the reliability of test results.
Courage + Khazaka has upgraded its well-known TEWL and barrier function measurement device, the Tewameter, with three probe heads for better efficiency.
According to Merriam-Webster, phenomenology is the study of consciousness and self-awareness as a philosophy. Putting this with epidermic led me to what the industry now considers wellness and corneocare, which Steventon describes.
Repeatability and reproducibility are crucial to validate any test method. In order to master these criteria, the authors developed an automated spreading device and compared it with human spreading. Application of the device in eight laboratories and using 36 sunscreens revealed great improvements via automated spreading, ensuring good intra- and inter-laboratory variability.