BVIS-CIR-0,25Oz: Black Visible and Clear IR 1/4 Ounce Ink $14.50 each + – Add to cart The add to cart button will appear once you select the values above Contact us for more information Black Visible and Clear in the Infrared above 800nm Ink 1/4 Ounce. This ink writes black in visible light and buts becomes transparent when viewed with an IR sensitive camera above 800nm. You can learn more about these inks by clicking here.