According to Huang Sen-kuei, Pai Kong's clay comes from a "montmorillonite" (magnesium aluminum silicate) mine. One clay granule with a diameter of one micron has 850 layers of montmorillonite inside, so that the thickness of each layer is only just over one nanometer.
黃森貴指出，百康的黏土出自一種鎂鋁矽酸鹽礦，以一個厚度一微米的黏土顆粒為例，裡面含有八百五十片鎂鋁矽酸鹽層，算來一片鹽層的厚度只有一奈米。