1, appearance: the appearance of standard carbon black should be free of impurities, no clots.
2, liquidity: good toner their mobility are generally very good, can take 20g carbon powder on white paper although later returned to the shaking, to observe the quality of its liquidity. Liquidity, good or bad, will affect the powder blackness, bottom ash, the transfer ratio.
3, smell: Standard toner should be no smell or sweet scented. Microstrip powder imported generally have fragrance smell.
4, charge amount of toner is charged: friction Guan Jian electric photo developing process.