1:it has irreguar prill granula
2:it has special deep black and light black effective.
3:it has the performance of extensive and vigorous
4:it is manufactured by dozen of processes such as Separation and aggregation, long time deposition,shade drying,grind etc.
others:
1:Seal,avoid light,place in 5-25 degree
2:More than 144
types color special writing brush ink can be made,OEM provided.