How To Make Permanent Ink Carbon Black And Iron Gall?

Permanent ink has been made for centuries using two main methods: dispersing carbon black in a binder, or combining iron salts with tannins to create iron gall ink. Carbon black ink is a suspension of fine pigment particles that sit on top of the paper. Iron gall ink is a chemical reaction that produces a dark, water-soluble compound that soaks into the fibers and becomes permanent. Both can be made at home with basic materials, but they require patience and careful measurement.

What Is Carbon Black Ink Made Of?

Carbon black ink is the simplest permanent ink to understand. It consists of three parts: a pigment, a liquid carrier, and a binder.

The pigment is carbon black, which is essentially pure carbon in a fine powder form. Historically this came from lampblack, which is soot collected from burning oil or resin. The carrier is usually water, though some recipes use alcohol or oil. The binder holds the pigment to the paper after the liquid evaporates. Common binders include gum arabic, shellac, or egg white.

Carbon black does not dissolve in water. It stays suspended as tiny solid particles. When you write, the water carries the particles onto the paper. When the water dries, the particles remain on the surface. The binder forms a thin film that locks the pigment in place.

This is why carbon black ink is so permanent. It is not a dye that can fade or wash away. It is a layer of solid carbon sitting on the paper. Carbon is chemically stable and does not react with light, air, or water. Documents written in carbon black ink can last for centuries if the paper itself survives.

How To Make Carbon Black Ink At Home

The basic recipe for carbon black ink is straightforward. You need carbon black powder, gum arabic, and distilled water.

Start with about 2 parts water to 1 part gum arabic. Let the gum arabic dissolve overnight. This creates the binder solution. Then add carbon black powder slowly while stirring. The mixture should be about the consistency of thin cream. Too much pigment makes the ink clog the pen. Too little makes the ink look gray.

Some recipes add a few drops of clove oil as a preservative. This prevents mold from growing in the ink bottle. Without a preservative, water-based ink will spoil within weeks.

Strain the finished ink through a fine cloth to remove any lumps. Store it in a glass bottle with a tight lid. Shake well before each use because the pigment will settle to the bottom over time.

The carbon black you buy matters. Artist-grade pigment is ground finely enough to stay suspended. Industrial carbon black may contain impurities or be too coarse. If you cannot find carbon black powder, you can collect soot from a candle or oil lamp, but the quality varies and the particles are often uneven.

What Is Iron Gall Ink?

Iron gall ink works completely differently from carbon black ink. It is not a pigment suspension. It is a chemical reaction that creates a colored compound.

The two main ingredients are iron sulfate and tannic acid. Iron sulfate is also called copperas or green vitriol. Tannic acid comes from plant sources, most commonly oak galls. Oak galls are abnormal growths on oak trees caused by insects laying eggs in the bark. The tree forms a protective lump around the eggs, and that lump is rich in tannins.

When you mix iron sulfate with tannic acid in water, they react to form iron tannate. This compound is pale gray or blue-black when first applied to paper. Over time, exposure to oxygen in the air oxidizes it, and it darkens to a deep black or brown-black color.

The critical difference from carbon ink is that iron gall ink soaks into the paper fibers. It does not sit on the surface. This makes it extremely difficult to erase. The ink becomes part of the paper itself.

How To Make Iron Gall Ink At Home

Making iron gall ink requires more steps than carbon black ink, but the process is well documented.

First, you need oak galls. Crush them into a coarse powder. A mortar and pestle works well. Then soak the crushed galls in water for several days. The water will turn light brown as the tannins leach out. Strain this liquid to remove the solid plant material.

Next, dissolve iron sulfate in the tannin solution. The traditional ratio is about 1 part iron sulfate to 3 parts oak galls by weight. Stir until fully dissolved. The liquid will turn dark blue-black almost immediately.

Add gum arabic as a binder. Without it, the ink may bead up on the paper instead of flowing smoothly. A small amount, about 5 percent of the total volume, is usually enough.

Finally, add a preservative. Clove oil or a few drops of vinegar work historically. Iron gall ink is acidic, so it naturally resists mold better than carbon ink, but it still needs some protection.

Let the ink settle for a week before using it. This allows the reaction to complete and any sediment to fall to the bottom. Pour off the clear liquid and discard the sediment.

Carbon Black Vs Iron Gall: Which Is More Permanent?

Both inks are permanent, but they fail in different ways.

Carbon black ink is chemically stable. It will not fade or react with anything. However, because it sits on the surface of the paper, it can be scraped off or washed away if the binder breaks down. The binder is the weak point. Gum arabic can degrade over time, especially in humid conditions.

Iron gall ink is physically bonded to the paper. It cannot be scraped off. But it has a well-known problem: it is acidic. Over centuries, the acid can eat through the paper itself. Many historical documents written in iron gall ink have suffered severe damage where the ink literally burned holes in the pages.

Modern conservation efforts focus on treating iron gall documents to neutralize the acid. This is a serious issue for archives holding centuries-old manuscripts.

For home use, both inks will last longer than the paper they are written on. The practical difference matters mostly for archival documents meant to survive hundreds of years.

Are There Safety Concerns With Making Ink At Home?

Yes, there are real safety concerns, especially with iron gall ink.

Iron sulfate is a metal salt. It can irritate skin and eyes. Wear gloves and goggles when handling the powder. Do not inhale the dust. Keep it away from children and pets.

The finished iron gall ink is acidic. Do not let it sit on your skin. Wash your hands after using it. Do not use it on metal pen nibs without cleaning them thoroughly afterward, because the acid will corrode the metal.

Carbon black powder is also a fine dust. Inhaling large amounts of any fine powder is not good for your lungs. Work in a well-ventilated area and consider wearing a dust mask when mixing the powder.

Neither ink is food-safe. Never use kitchen utensils for ink making that you will later use for cooking. Label all containers clearly and store them out of reach of children.

Do These Inks Work In Modern Pens?

Traditional dip pens work best with both inks. The nib can be cleaned easily, and the ink flow can be controlled by how much you dip.

Fountain pens are a different matter. Carbon black ink contains solid particles that can clog the narrow channels inside a fountain pen feed. If the ink dries inside the pen, it is very difficult to clean out. Some fountain pen enthusiasts use specially formulated pigmented inks, but these are manufactured with ultrafine particles and added surfactants. Homemade carbon ink is likely to cause problems.

Iron gall ink is also risky in fountain pens. The acidity can corrode steel nibs. Modern iron gall inks made for fountain pens contain additives to reduce corrosion, but homemade versions do not. Stick to dip pens for both inks.

How Long Do These Inks Last On Paper?

Carbon black ink can last indefinitely under good conditions. The pigment itself does not degrade. The limiting factor is the paper and the binder. Acid-free paper with carbon black ink should survive for centuries.

Iron gall ink also lasts a very long time, but its lifespan depends on the acidity level. Well-made iron gall ink on good paper can last centuries. Poorly made ink with excess iron sulfate will eat through paper much faster. Some historical iron gall documents have shown significant damage within 100 to 200 years.

Neither ink should be exposed to direct sunlight for extended periods. Ultraviolet light degrades paper and can break down the binder in carbon ink. Store important documents in dark, dry, cool conditions.

What Is The Best Way To Store Homemade Ink?

Store both inks in glass bottles with tight-fitting lids. Plastic bottles can react with the acidic iron gall ink over time.

Keep the bottles away from direct sunlight and temperature extremes. A cool, dark cupboard is ideal.

Carbon black ink will separate over time. The pigment sinks to the bottom. Shake the bottle thoroughly before each use. If the ink becomes too thick, add a few drops of distilled water.

Iron gall ink also settles. The sediment at the bottom is harmless, but it can clog your pen. Pour the ink carefully, or filter it through a coffee filter if the sediment becomes excessive.

Both inks will eventually spoil. If you see mold growing on the surface, discard the ink and start fresh. Mold can ruin the ink and may release spores that are not healthy to breathe.