GREAT VALUE. Replenish stamp foam ink pads, felt pads, or self-inking stamps. Not for pre-inked or gel stamps (see description). NON-TOXIC. Water-based, low odor, skin-safe and environmentally friendly. Works on porous surfaces such as paper and wood. NOT work on wax, plastics, etc. without drying apparatus. DURABLE AND PERMANENT. Waterproof after drying. Outdoor-grade weatherproof. Non-fading. Made of sturdy pigment polymer resin; it doesn't fade under direct sunlight. CRISP AND CLEAR PRINT. Vibrant and intense color will not bleed or spread on paper, which make the print sharper EASY APPLICATION. From bottle, put four to six drops of ink on a dried stamp pad. Do not over-ink the pad. Works with most stamps. Carefully choose the ink you use when you refill your stamp. This BCH product is a water-based pigment formula, and it is for porous surfaces. WATER-BASED vs OIL BASED. The selection of ink depends on the type of stamp. The self-inking stamp uses BCH water-based ink, and the pre-inked stamp uses BCH oil-based ink. Self-inking stamps either use a felt pad (not a gel pad) or have an inner refillable pad, while pre-ink stamps soak the stamp ink inside their rubber and release the ink with a simple press. Both stamps are refillable, but you need to select the correct type of ink. There are some pads that are rubber gel pads rather than felt pads, so these pads will need oil-based ink too. PIGMENT vs DYE INK FORMULA. Dye ink is the classic scrapbooking ink. Dye ink is not waterproof and fades in sunlight. BCH Pigment ink is more vibrant in intensity is waterproof, does not bleed, and is UV proof after drying. It additionally has a much longer life than dye ink. POROUS vs NON-POROUS SURFACE. Water and oil-based stamps work well with porous (paper, wood, popsicle sticks…) or semi-porous surfaces. Neither water-based or oil-based ink can be used with non-porous surfaces directly. Examples of non-porous surfaces include glass, glossy paper, vinyl, milk cartons, and ice cream lids. A solvent-based BCH stamp ink will be needed in the application to non-porous surfaces if you want to use it directly. However, a heating tool can be used to shorten drying time, so the water-based ink can be used on glossy surfaces. BCH Stamp Ink Refill complies with standards and regulations like the REACH, SVHC, TSCA, IEC, California Proposition 65, CEA List, JGPSSI-Substance List. The stamp ink refill is suitable to mark food packaging according to USDA. FDA-Code of Federal Regulations 21. Section 175.105(a)(2). DO NOT USE THIS STAMP INK REFILL AS FOOD COLOR! Do not use on food directly. Do not drink or ingest.