** BP11 CAN ONLY PRINT ON POROUS MATERIAL. PLEASE REFER TO BP12 Black, BP21 White, BP31 Red, BP41 Yellow, BP51 Blue, BP61 Green and BP71 Invisible FOR PRINTING ON NON-POROUS MATERIAL SUCH AS GLASS, PLASTIC, METAL, ALUMINUM, ETC. ** Sanjet BP11 (JW11) Ink Cartridge Overview The Sanjet BP11 Black Water-Based Ink is excellent for marking porous material such as boxes, corrugate, cardboard, paper, etc. Substrates The Sanjet BP11black ink offers excellent adhesion on porous substrates.