One of the reasons for such concentration of accreditation in some specific fields was that the accreditation work had been promptly conducted with the primary importance being given to the prevention of overseas outflow of art objects.
美術品の海外流出防止ということを第一義に、迅速に認定作業が進められたことも、特定分野に認定品が偏っていることの一因とされている。