A toner is provided that, even in a small amount thereof, gives a satisfactory image density and that is free of image problems, e.g., fogging and offset resistance, even during long-term use and in a high-temperature, high-humidity environment. The toner contains a binder resin, a pigment, and a prescribed azo compound wherein, designating as (A) the solubility of the azo compound in a toluene-hexane solubility test and as (B) the solubility of the binder resin constituting the toner in the toluene-hexane solubility test, the (A) and the (B) satisfy the relationship |(B)−(A)|≦60.
提供了一种调色剂,即使只有少量,也能给出令人满意的图像密度,并且即使在长期使用和高温高湿环境下也不会出现图像问题,例如雾化和抗偏移性。该调色剂包含结合
树脂,
颜料和规定的偶氮化合物,其中,在
甲苯-己烷溶解度测试中将偶氮化合物的溶解度指定为(A),将组成调色剂的结合
树脂的溶解度指定为(B),(A)和(B)满足关系式 |(B)-(A)|≦60。