Sanjet BP41 (JS41) Ink Cartridge, Yellow The Sanjet BP41 Yellow Ink is excellent for marking porous and non-porous substrates. Sanjet BP41 dry time is typically instant to a few seconds but can take longer depending on application and environment conditions. Perfect for printing on dark surfaces. Substrates The Sanjet BP41 yellow ink offers excellent adhesion on glass, plastic, metal, aluminum, concrete, pipe, glossy boxes, film, corrugated boxes, paper, and many other substrates.