kˈeɪəlˌɪnbˈeɪst spɹˈeɪz hɐvbɪn stˈʌdid ɛkstˈɛnsɪvli sˈɪns nˈaɪntiːnhˈʌndɹɪd nˈaɪnti nˈaɪn ænd ɹᵻsˈɜːtʃ hɐz ɪstˈæblɪʃt ðæt ðiːz spɹˈeɪz dᵻpˈɑːzɪt ˈeɪ "pˈɑːɹɾɪkəl fˈɪlm" ðæt hɐz nˈuːmɚɹəs bˌɛnɪfˈɪʃəl ɪfˈɛkts ˌɔn plˈænts ænd ɪn ˈɪnsɛkt pˈɛst kəntɹˈoʊl.
Kaolin-based sprays have been studied extensively since 1999 and research has established that these sprays deposit a "particle film" that has numerous beneficial effects on plants and in insect pest control.