Аннотация:In this paper we study multiple reflection effect in a fold of material with regard to color constancy problem. Namely we consider light source chromaticity estimation using perceived material color. We measured relative spectra of reflected light source emission for different positions underfolds. Experiment was performed on 105 fabric samples. Using this data we discuss applicability of different spectral models for description of observed chromaticity deviation in different fold’s areas. Obtained experimental data was released in open access.