MSSC Marsh EFI stencil ink. The efi stenciling system provides crisp, clear marks on a wide variety of porous and non-porous surfaces. The stencil marks are fast drying, permanent, as well as fade and sunlight resistant. Best of all, since the inks have an ultralow VOC content, they are more environmentally safe to the operator applying the markings and to the atmosphere. The inks are water soluble and only require soap and water for clean-up. (No separate solvents required). Since our new efi inks are also non-flammable; they are safer to use and easier to ship than most other stencil inks.