Colby students are among a group of women calling for tighter regulation of cosmetics and personal care products, which they say contain potentially harmful chemicals. “[Michelle Russell ’11] and Colby students Blair Braverman [’11] and Sarah Hart [’10] studied the issue as part of a course they took with Colby Professor Gail Carlson about environment and human health. … ‘A chemical should be proven safe before it’s used, as opposed to using it until it’s proven safe,’ Hart said.