Sanjet BP51 (JS51) Ink Cartridge, Blue The Sanjet BP51 Blue Ink is excellent for marking porous and non-porous substrates. The Sanjet BP51 dry time is typically instant to a few seconds but can take longer depending on application and environment conditions. Substrates The Sanjet BP51 blue ink offers excellent adhesion on glass, plastic, metal, aluminum, concrete, pipe, glossy boxes, film, corrugated boxes, paper, and many other substrates.