Prolong the use of your pre-inked stamp by re-inking the pad with this black ink. The ink is will provide clear contours and sharpness for an impression that will last for years to come. Environmentally conscious, the ink is water based so features no toxic substance, acid, formaldehyde or heavy metals. The ink is also hygroscopic which means it will absorb the humidity in the surrounding air so it doesn't dry it, further extending its optimal use.