| 摘要 |
PURPOSE:To enhance the preservability of a recording image, to especially reduce the deterioration due to indoor discoloration and to enhance image density by containing pigment specified in its BET specific surface area and iodine adsorbing quantity per a unit surface area as main pigment. CONSTITUTION:Pigment having a BET specific surface area of 30-120m<2>/g and iodine adsorbing quantity per a unit surface area of 1.5mg/m<2> or more is contained as main pigment. This iodine adsorbing quantity per a unit surface area is given as a value calculated by dividing coding adsorbing quantity per a unit wt., which is calculated from the iodine reduction amount (mg) from a carbon tetrachloride solution of iodine after the immersion of pigment of a unit wt. 1g in the carbon tetrachloride solution of iodine for a definite time, by a specific area. The desirable particle size of the primary particle of the pigment is pref. 20mum or less, more pref., 5mum or less, most pref., 0.01-5mum. By this method the preservability of a recording image is enhanced and a sharp image of high resolving power can be formed. |
