(1) preparing a 1.0 mass% CNF aqueous dispersion, (2) adding a colorant to the CNF aqueous dispersion, and stirring with a vortex mixer, and (3) CNF containing a colorant The process of sandwiching two glass plates so that the film thickness of the dispersion is 0.15 mm, and (4) observing the film of the CNF aqueous dispersion containing the color material sandwiched between the two glass plates with a microscope The CNF dispersion index is calculated from the step, (5) the step of classifying the observed aggregates according to their size (long diameter), and (6) the number of the classified aggregates, and the dispersibility of the CNF aqueous dispersion is evaluated. Method of evaluating a CNF dispersion comprising the steps of（１）１．０質量％のＣＮＦ水分散液を準備する工程と、（２）ＣＮＦ水分散液に色材を添加し、ボルテックスミキサーで撹拌する工程と、（３）色材を含有するＣＮＦ分散液の膜厚が０．１５ｍｍになるように二枚のガラス板に挟む工程と、（４）二枚のガラス板に挟んだ色材を含有するＣＮＦ水分散液の膜を顕微鏡で観察する工程と、（５）観察された凝集物をその大きさ（長径）により分類する工程と、（６）分類した凝集物の個数からＣＮＦ分散指数を算出し、ＣＮＦ水分散液の分散性を評価する工程を含むＣＮＦ分散液の評価方法。
