Sanjet BP61 (JS61) Ink Cartridge, Green The Sanjet BP61 Green Ink is excellent for marking porous and non-porous substrates. Sanjet BP61 dry time is typically instant to a few seconds but can take longer depending on application and environment conditions. Substrates The Sanjet BP61 green ink offers excellent adhesion on glass, plastic, metal, aluminum, concrete, pipe, glossy boxes, film, corrugated boxes, paper, and many other substrates.