baɪ səpɹˈɛsɪŋ ðə dᵻfjˈuːz ˌʊltɹɐvˈaɪəlɪt ɹᵻflˈɛktəns, ðə dᵻɹˌɛkʃənˈælᵻɾi ænd spˈɛktɹəl pjˈʊɹɹᵻɾi ʌvðɪ ˌɪɹɪdˈɛsəns ɪz hˈaɪʔn̩d.
By suppressing the diffuse ultraviolet reflectance, the directionality and spectral purity of the iridescence is heightened.