From 2013-2020, advisor and columnist Trefor Evans, Ph.D., wrote the column series, "Testing Tactics in Hair" for Cosmetics & Toiletries (C&T), covering methods to measure hair damage, treatments, claims and more. It is a treasure trove of information for those working in the hair care segment.
Following is an index of these works, linked to the full articles in past digital editions of C&T; plus two archived articles (one provided as a download, one linked to our website), to complete the set. Note that you must be logged in to access the digital magazines but creating an account is FREE. Also, please allow several moments for the pages to load. We hope this is a useful tool to you.
November 2014: Hair as a Test Substrate
May 2013: Consumer vs. Scientific Language: Relating In vivo and In vitro (beginning of column)
March 2014: Measuring the Water Content of Hair
Jan/Feb 2015: Quantifying Hair Color Fading
May 2015: Defining and Controlling Frizz
June 2015: Beating the Damaging Effects of Heat on Hair
March 2016: Modifying Hair's Structure from the Inside
April 2017: How Damaged is Hair? Part One: Surface Damage
July/Aug 2017: How Damaged is Hair? Part III: Better Defining the Problem
Nov/Dec 2018: Quantifying Visual Aspects of Hair
March 2019: Tress Stress: How the Environment Affects Hair
June 2019: Grooming Habits: A New Focus for Ethnic Care
Nov/Dec 2019: A Soft Touch: Concepts in Hair Softness
June 2020: Beyond Biology: Why African Hair is Fragile
Sept 2020: Testing Equipment: A 'Buyer's Guide'