Trodat Replacement Ink Cartridge 6/46045 - pack of 3
The ink is water based and contains no toxic substances, no acid, no formaldehyde and no heavy metals. The replacement ink cartridges are available in black, blue, red, green and violet.. The ink is hygroscopic, meaning that it self regulates by absorbing the humidity of the surrounding air so that it does not dry out, allowing prolonged usage.