 B. Schulz

B. Schulz is the first-listed author of a 2002 experimental study of human nail samples using ellipsometry. The paper gives an affiliation in applied physics and microstructure research at the University of Hamburg; its indexed byline retains the initials rather than a verified full given name.^[ref]

The experiment followed changes in the complex refractive index during hydration and dehydration. Its authors interpreted the response using faster and slower water-associated processes in keratin. That connects an optical measurement to the changing physical condition of a biological material, rather than treating nail thickness or optical properties as fixed constants.^[ref]

A full name, independent biographical details and a securely attributable portrait remain unverified; no namesake identification is assumed.