The ITO powder has a minimum value of a diffused reflection functional logarithm, logf, at a light wavelength of 470 nm or lower, which logarithm is measured on the basis of {TAIL ~ the following equation}, f=2/2Rd=α/S (Rd: a relative reflectance to a standard sample, α: an absorption coefficient, S: a scattering coefficient, formulated for a diffused reflection light, and the minimum value of {HEAD ~ −0.1} or less 
The ITO powder has a minimum value of a diffused reflection functional logarithm , logf , at a light wavelength of 470 nm or lower , which logarithm is measured on the basis of { TAIL ~ the following equation } , f=2/2Rd = α / S ( Rd : a relative reflectance to a standard sample , α : an absorption coefficient , S : a scattering coefficient , formulated for a diffused reflection light , and the minimum value of { HEAD ~ −0.1 } or less
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