Specifications 1)indelible ink with silver nitrate 2)indelible ink bottle 3)indelible ink bottle with brush 4)indelible ink pen 5)indelible ink pad Indelible ink is used for election voting. The silver nitrate indelible ink contents silver nitrate from 5 to 25%, and the colour in the finger can keep above 168 hours. The ink can not be washed off by water, alcohol and bleach.we can offer different colours , such as purple ,blue,green ,red and so on. The ink in bottle(from 30ml to 100mL) with a sponge, aluminum sheet sealed, inside plastic bage, and outside have the lable. We can produce at least 25000 bottles per day by the automatic filling machine. And the pen can keep 3mL ink. We can produce 50000 pens per day.