1. Department of Chemistry and Material Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo‐ku, Kyoto 606‐8585, Japan
2. Department of Design Engineering and Management, Kyoto Institute of Technology, Matsugasaki, Sakyo‐ku, Kyoto 606–8585, Japan
3. Department of Colour Chemistry, University of Leeds, Leeds LS2 9JT, UK