Carbon Ink

Part of Pigments and Paint

Making carbon-based ink for writing, drawing, and record-keeping — the most permanent and widely-produced ink in human history.

Why This Matters

Carbon ink is the single most important writing material a rebuilding community can produce. It is the ink of the Dead Sea Scrolls, Chinese imperial records, Egyptian administrative documents, and medieval European manuscripts. Some carbon ink inscriptions remain perfectly legible after 4,000 years. No other ink approaches this longevity. In a world where preserving knowledge is literally a matter of civilization’s survival, the ability to make permanent ink from universally available materials is an essential skill.

Carbon ink is also remarkably simple. At its most basic, it is soot mixed with water and a binder. Soot is pure carbon, which is chemically inert — it does not fade in light, does not react with paper or parchment, and does not break down over time. This chemical stability is what makes carbon ink effectively permanent. Unlike iron gall ink (which eventually eats through paper) or plant-based inks (which fade in years), carbon ink remains unchanged for millennia.

The materials are available everywhere fire exists. Any combustion process produces soot, and any animal or plant can provide a binder. A community can go from having no ink at all to producing high-quality, permanent writing fluid in a single afternoon. The refinement of technique — making ink that flows well, dries quickly, does not smear, and produces crisp lines — takes longer to master but is well within reach of anyone willing to experiment.

Understanding Carbon Ink

Components

Every carbon ink has three essential components:

Component	Function	Sources
Carbon particles (pigment)	Provides the black color	Lampblack, charcoal dust, bone black
Binder	Holds carbon to the writing surface	Hide glue, gum arabic, egg white, casein
Vehicle (carrier)	Makes the mixture liquid and flowable	Water (always)

Optional additives improve specific properties:

Additive	Function	Sources
Preservative	Prevents mold in stored ink	Vinegar, salt, clove oil, camphor
Surfactant	Improves flow and wetting	Bile (from animal gallbladders), soap
Fragrance	Masks odor of animal-based binders	Essential oils, camphor, clove

Carbon Particle Quality

The quality of your ink depends primarily on the fineness and purity of the carbon particles:

• Lampblack — the finest and purest carbon, collected from flames burning oils or resins. Produces the deepest, most uniform black.
• Charcoal powder — coarser than lampblack but readily available. Must be ground extremely fine for good ink.
• Bone black — calcined bone ground to powder. Contains calcium phosphate as well as carbon, giving a slightly warm, brownish-black tone.
• Candle soot — collected from tallow or beeswax candles. Quality varies with the fuel type.

Collecting Lampblack

The Lamp Method

The traditional and highest-quality approach:

1. Set up a lamp — any oil lamp or grease lamp works. Use the most resinous, smoky fuel available:

   • Pine resin/pitch (best — produces fine, pure soot)
   • Sesame oil (traditional Chinese choice)
   • Rapeseed/canola oil
   • Linseed oil
   • Animal fat/tallow (adequate but produces coarser soot)

2. Position a collector — hold a ceramic plate, smooth stone slab, or metal sheet in the smoke plume, 5-10 cm above the flame. The soot deposits as a fine, velvety black coating.

3. Scrape and collect — when a thick layer has accumulated (every 15-30 minutes), use a feather or soft brush to sweep the soot into a container. Handle gently — lampblack is extraordinarily light and a breath of wind scatters it.

4. Repeat — collecting lampblack is slow. Expect to gather 5-15 grams per hour depending on the lamp and fuel. A day’s collection produces enough for several months of moderate writing.

Collection Chimney

Build a simple chimney over the lamp from a ceramic tube or stacked clay rings. Place the collection plate at the top. The chimney concentrates the smoke and makes collection more efficient while reducing waste.

The Pot Method

A faster but coarser collection method:

1. Invert a pot over a smoky fire — use a fire fed with resinous wood (pine, spruce) or with added pine pitch
2. Support the pot on stones so it sits 10-20 cm above the flames
3. Burn for 1-2 hours — soot accumulates on the pot’s inner surface
4. Cool and scrape — once cool, scrape the soot from the pot interior with a wooden tool
5. Grind — this soot is coarser than lampblack and must be ground finely (see below)

Grinding Carbon

All carbon sources except the finest lampblack need grinding to produce smooth ink:

1. Place carbon on a grinding slab — a flat, smooth stone (marble, granite, or slate)
2. Add a few drops of water — wet grinding prevents dust and produces finer particles
3. Grind with a muller — a smooth-bottomed stone held in the palm, worked in circular motions with firm pressure
4. Grind for 20-30 minutes minimum — the carbon should feel silky-smooth between your fingers with no grittiness whatsoever
5. Test — draw a line with your finger across a smooth surface. It should be uniform and streak-free. If grainy, continue grinding.

Ink Recipes

Basic Lampblack Ink

The simplest usable recipe:

1. Lampblack: 1 part by volume
2. Water: 4-6 parts
3. Gum arabic solution (or hide glue): 1 part

Mix the lampblack with a small amount of water to form a thick paste. Grind on a stone slab until perfectly smooth. Gradually add more water, stirring continuously, until the desired consistency is reached. Add the binder and mix thoroughly. Strain through fine cloth to remove any lumps.

Chinese-Style Stick Ink

The most refined form of carbon ink, used in East Asia for over 2,000 years:

1. Collect fine lampblack — use pine resin smoke for the highest quality
2. Mix with hide glue — warm hide glue solution and mix with lampblack at a ratio of roughly 1:1 by weight (adjust for desired hardness)
3. Add fragrance — a small amount of camphor or musk (optional but traditional)
4. Knead — work the mixture like dough, folding and pressing for 10-15 minutes until uniform
5. Mold — press into a wooden mold or form into a stick shape by hand
6. Dry — air dry slowly (weeks to months) in a cool, shaded area. Turn periodically to prevent warping.
7. Use — grind the dried ink stick on a wet stone (an ink stone with a smooth grinding surface and a well for water collection). The friction releases a controlled amount of ink, which collects in the well. Add water as needed to adjust density.

Ink Stick Advantages

Stick ink stores indefinitely — sticks from the Song Dynasty (960-1279 CE) are still usable. The ink is always freshly ground, preventing the mold and settling problems that plague liquid ink. This is the ideal format for long-term ink storage.

Writing Ink with Preservative

For liquid ink that keeps for weeks or months:

1. Lampblack: 15 grams
2. Gum arabic: 5 grams, dissolved in 20 ml warm water
3. Water: 80 ml
4. Vinegar: 5 ml (preservative)
5. Pinch of salt (additional preservative)

Grind lampblack with a small amount of the gum solution. Gradually add water, grinding continuously. Add vinegar and salt. Strain through fine cloth into a sealed container. Shake before each use, as carbon settles over time.

Heavy Drawing Ink

For bold, opaque lines and solid fills:

1. Double the carbon concentration of the basic recipe (1 part lampblack to 2-3 parts water)
2. Use extra binder (1.5 parts gum arabic solution)
3. Add a drop of bile or soap solution to improve flow despite the high pigment load
4. This ink dries to a dense, matte black with excellent opacity

Quality Testing

Ink Quality Indicators

Test	Good Ink	Poor Ink
Flow from pen	Smooth, consistent	Skipping, blobbing, or clogging
Line quality	Crisp edges, even density	Fuzzy edges, uneven darkness
Drying time	10-30 seconds	Too fast (pen dries out) or too slow (smears)
Dried appearance	Deep, matte black	Gray, shiny, or translucent
Rub test	Does not smear when rubbed firmly	Smears or flakes off
Water resistance (dried)	Slight resistance	Dissolves immediately

Adjusting Problems

Problem	Cause	Fix
Ink too thick	Too much carbon or not enough water	Add water gradually
Ink too thin/gray	Not enough carbon	Add more ground lampblack
Ink clogs pen	Particles too coarse	Re-grind and strain through finer cloth
Ink smears after drying	Insufficient binder	Add more gum arabic or glue
Ink flakes off	Too much binder	Reduce binder; add more water
Ink feathers on paper	Ink too thin, or paper too absorbent	Thicken ink, or size the paper with starch
Mold growth in stored ink	No preservative	Add vinegar and salt; store in sealed container

Storage and Preservation

Liquid Ink Storage

• Store in sealed ceramic or glass containers (never metal — ink corrodes many metals)
• Keep in a cool, dark location
• Add a preservative (vinegar, salt, clove oil) to prevent mold
• Shake or stir before each use — carbon always settles eventually
• Shelf life: 1-6 months depending on preservative and conditions

Ink Stick Storage

• Keep dry — moisture softens the glue binder
• Store in a cloth or paper wrapping in a box
• Avoid temperature extremes that can crack the stick
• Shelf life: effectively unlimited (centuries)

Dried Ink Cakes

An intermediate storage form:

1. Pour liquid ink into shallow dishes or molds
2. Allow to dry completely (several days to weeks)
3. The dried cakes store indefinitely
4. To use, break off a piece and dissolve in warm water with stirring
5. May need additional binder when reconstituted

Applications Beyond Writing

Carbon ink serves many purposes beyond ordinary writing:

• Technical drawing — architectural plans, maps, diagrams
• Record-keeping — permanent ledgers, census records, legal documents
• Tattooing — carbon ink is the traditional and safest tattoo pigment (using sterile needles and technique)
• Marking tools and equipment — identifying ownership and purpose
• Textile printing — with appropriate binder modifications, carbon ink can mark cloth permanently
• Stencil work — marking repeated patterns, letters, or symbols on any surface

For colored ink variants, see Colored Inks.