Carbon black is the tiny powder which produced through the incomplete combustion of raw material containing carbon (silicon). The outward appearance is pure black or pure white fine grain or powdery. The depth of the color, the granularity, and the proportion are different when they have the difference in raw material and the manufacture craft. The basic constituent is the carbon (silicon) and few iron, hydrogen, oxygen, sulfur, ash, tar, and water classification,etc. so many sellers on internet .we are compelled to give you better price .welcom to vist our company .after autoptical we must build good cooperate.if yu bnsy ,we can offer 500g sample for free ,pls feel free to contact us .thank you sir !