title: A method for the detection of the refractive index of irregular shape solid pigments in light absorbing liquid matrix.
abstract: The immersion liquid method is powerful for the measurement of the refractive index of solid particles in a liquid matrix. However, this method applies best for cases when the liquid matrix is transparent. A problem is usually how to assess the refractive index of a pigment when it is in a colored host liquid. In this article we introduce a method, and show that by combining so-called multifunction spectrophotometer, immersion liquid method and detection of light transmission and reflection we can assess the refractive index of a pigment in a colored liquid, and also the extinction or absorption coefficient of the host liquid.
authors.affiliation: Measurement and Sensor Laboratory, University of Oulu, Technology Park 127, Kajaani, Finland. ilpo.niskanen@oulu.fi
authors.forename: Ilpo
authors.initials: I
authors.lastname: Niskanen
authors.forename: Jukka
authors.initials: J
authors.lastname: Räty
authors.forename: Kai-Erik
authors.initials: KE
authors.lastname: Peiponen