What Is Printer Ink Made Of? Inkjet Ink and Laser Toner Ingredients Explained

Quick answer: most home inkjet ink is mostly water (roughly half to four-fifths of it), plus glycols and other humectants that stop it drying in the nozzles, a small amount of colorant (either dissolved dye or tiny solid pigment particles), and a dash of additives such as surfactants, pH buffers and biocides. Laser toner isn't ink at all: it's a dry plastic powder of polymer resin, pigment or carbon black and wax that the printer melts onto paper.

Updated October 8, 2026 · By William Elward, founder of Castle Ink (helping people with printers and ink since 2005)

What Are the Main Ingredients in Inkjet Ink?

Every manufacturer guards its exact formula, but the published patent literature and the safety data sheets printed for every cartridge describe the same basic building blocks. Wikipedia's summary of inkjet printing puts it simply: desktop inks are a mixture of water, glycol and dyes or pigments.

• Water (about 50–80%). The carrier. It keeps the ink thin enough to be fired through nozzles narrower than a human hair, and it evaporates or soaks into the paper after printing.
• Co-solvents and humectants (about 10–40%). Glycols such as glycerin, ethylene or propylene glycol and similar compounds slow evaporation so the ink doesn't crust over in the printhead between jobs. They also tune viscosity and help the ink dry evenly.
• Colorant (about 1–10%). The part you actually see on the page: a dye or a pigment (explained below).
• Additives (usually under 3%). Surfactants control how the ink wets and spreads on paper; buffers keep the pH stable; biocides stop mold and bacteria growing in a water-based liquid; other agents reduce paper curl or help the ink resist smearing.

Those ranges are typical figures, not any one brand's recipe. For a specific cartridge, the manufacturer's Safety Data Sheet (SDS) lists the hazardous ingredients and their concentration ranges. HP explains where to find SDS documents for HP cartridges, and Canon, Epson and Brother publish theirs on their support sites.

What Is the Difference Between Dye Ink and Pigment Ink?

Dye colorants dissolve completely in the liquid, like sugar in water. They soak into the paper fibers, give bright, saturated color and are ideal for photos on glossy paper, but they're more prone to fading and to running if the page gets wet. Pigment colorants are microscopic solid particles suspended in the liquid. They sit closer to the paper surface, so text looks crisper and resists water, highlighters and fading far better.

Lots of printers mix the two. Canon PIXMA models pair a pigment black "PGI" cartridge for documents with dye-based "CLI" colors, as in our Canon PGI-280XXL / CLI-281XXL 5-pack. Epson sells pigment DURABrite inks for office printers and dye-based Claria inks for photo models, such as the Epson 702XL 4-pack (DURABrite pigment) for WorkForce Pro printers. For a full comparison, read pigment vs dye ink.

What Gives Printer Ink Its Color?

Color printers build every shade from four process colors: cyan, magenta, yellow and black (CMYK). Overlapping tiny dots of cyan, magenta and yellow create the rest of the spectrum; black is added because mixing the three never makes a truly deep, neutral black, and it would waste a lot of ink. Black pigment inks commonly use carbon black, essentially very fine soot. Photo printers add extra colors (light cyan, light magenta, gray, photo black) for smoother skin tones and gradients. To see how those droplets actually get onto the page, read how an inkjet printer works.

What Is Laser Toner Made Of?

Toner contains no water or solvent. It's a dry powder made mostly of plastic. According to Wikipedia's article on toner, the main ingredients are:

• Polymer resin, usually a styrene-acrylate copolymer or polyester, that melts at a low temperature and binds to the paper.
• Colorant: carbon black for black toner, color pigments for cyan, magenta and yellow.
• Wax to help the toner release cleanly from the hot fuser roller.
• Flow and charge-control additives such as fumed silica, so the powder pours freely and holds the static charge the printer uses to place it.

Modern toner particles are only a few microns across; finer particles are what make 1200 dpi laser text possible. The printer uses static electricity to stick toner to a drum in the shape of your page, transfers it to paper, then the fuser melts it permanently in place, which is why laser pages come out warm. Our explainer on how a laser printer works covers each step.

What About Sublimation, DTF and Wide-Format Inks?

• Sublimation ink uses disperse dyes that turn into a gas under a heat press and bond with polyester fibers or polymer-coated blanks. Browse our sublimation ink.
• DTF and DTG inks are water-based pigment inks, plus a white ink loaded with titanium dioxide so designs show up on dark garments. See DTG vs DTF.
• Latex inks for wide-format printers suspend pigment and polymer "latex" particles in water; the printer's heaters cure them into a durable film. An example is the HP 831 Latex ink used by HP Latex 310–370 printers.
• Solvent and UV inks used in sign shops are a different chemistry entirely and aren't found in home printers.

Is Printer Ink Toxic?

Ordinary inkjet ink and toner are low-hazard in normal use, but they aren't meant to be eaten, inhaled or left on skin. Wash spills off with soap and water, and keep cartridges away from children and pets. The cartridge's SDS lists first-aid steps. For a full rundown see is printer ink toxic? and, for stains, how to get printer ink off your hands, skin and clothes.

Why Is Printer Ink So Expensive if It's Mostly Water?

You're not paying for the ingredients. You're paying for research, patents, the precision cartridge and chip, and above all a business model in which printers are sold cheaply and profit comes from ink. Remanufactured and compatible cartridges use the same type of ink chemistry at a far lower price. More in why printer ink is so expensive and compatible vs remanufactured vs OEM ink.

Does Printer Ink Go Bad?

Yes, slowly. Over time water evaporates through the cartridge, pigments can settle, and the ink thickens enough to clog nozzles. Most cartridges carry an install-by date about two years out. See does printer ink expire?

Frequently Asked Questions

Is printer ink water-based?

Almost all home and office inkjet ink is water-based. Toner is a dry powder, and some commercial inks are solvent-, oil- or UV-cured.

Is black printer ink made of carbon?

Many pigment black inks use carbon black as the colorant, and black toner does too. Dye-based blacks use synthetic black dyes instead.

Does printer ink contain plastic?

Liquid inkjet ink is mostly water and solvents, though some pigment inks contain small amounts of polymer binder. Toner, on the other hand, is mostly plastic resin.

Can I mix different brands of ink?

It's best not to mix inks inside one cartridge or refill bottle: different humectants and colorant types can react and clog the printhead. Swapping complete cartridges between brands is fine.

Is remanufactured ink the same as original ink?

Quality remanufactured cartridges use inks formulated to match the original's type (dye or pigment) and color. Castle Ink's remanufactured ink cartridges are backed by our 100% satisfaction guarantee.

Find the Right Ink for Your Printer

Now that you know what's inside, find the right cartridges for your model on our Find Ink by Printer page, or shop HP, Canon, Epson and Brother ink, plus Brother toner. Curious what ink really costs? See our Printer Ink Price Index.

Sources

• Wikipedia: Inkjet printing (ink types and composition)
• Wikipedia: Toner (printing) (resins, additives and particle size)
• HP Sustainability Support: Where can I find Safety Data Sheets for HP printing cartridges?
• Epson: Micro Piezo technology (why heat-free printheads can use a wider range of inks)