Toner for developing electrostatic latent image and method of preparing the same

A toner for developing an electrostatic latent image comprising a latex, a colorant, a releasing agent, sulfur (S), iron (Fe) and silicon (Si),

• wherein the toner has G′(60) of about 4.0×107 Pa to about 4.0×108 Pa, G′(60)/G′(80) of about 100 to about 500 and G′(100, 140) of about 3.0×103 Pa to about 1.5×105 Pa,
• wherein the G′(60) and G′(80) are storage moduli Pa at 60° C. and 80° C. under measurement conditions of an angular velocity of about 6.28 rad/s and a heating rate of 2.0° C./minute, respectively,
• wherein the G′ (100, 140) is a storage modulus Pa at a temperature of 100° C. to 140° C. under measurement conditions of an angular velocity of about 6.28 rad/s and a heating rate of 2.0° C./minute, and
• wherein when S content, Fe content and Si content according to a fluorescence X-ray, analysis are referred to as [S], [Fe] and [Si], respectively, a ratio of [S]/[Fe] is in the range of 5.0×10−4 to 5.0×10−2, and a ratio of [Si]/[Fe] is in the range of 5.0×10−4 to 5.0×10−2.