indelible ink for election

1)indelible ink ,different colors ,for election 2)with sliver nitrate,can't be washed by water 3)stay for about 15 days

1)indelible ink ,different colors ,for election2)with sliver nitrate,can't be washed by water 3)stay for about 15 days.when the ink tipped on the finger ,turn to black color4)the silver nitrate contending can be required by customer.

5)enough experence in election,export the ink for Iraq,Tanzania,Afghanistan ,Nigeria