Pens and Nibs

The Fountain Pen as a Fluid System

A fountain pen is not just a nib attached to an ink reservoir. It is a balanced fluid system, and understanding that balance changes how you read every pen problem you will ever encounter.

The core mechanism is capillary action: the feed — the grooved plastic or ebonite component that sits directly under the nib — uses small parallel channels (typically 0.1–0.5 mm) to draw ink continuously from the reservoir toward the nib. Surface tension and capillary force do the heavy lifting; gravity assists by keeping ink moving in the right direction, which is why a fountain pen must be held nib-down to function.

The nib's central slit is the final stage of this capillary chain. As the nib contacts paper, the slit pulls ink through to the writing tip; narrower slits produce drier, finer lines, wider slits produce wetter, broader ones.

Ink flow and air flow are coupled. The feed contains both ink channels and a larger air channel: as ink exits the reservoir, air must enter to replace it. Without this pressure equalization, the system stalls — ink stops flowing or floods unpredictably. Every flood or dry-out problem in a fountain pen traces back to a failure in this air-ink balance.

Fig 1

Nib Size and Ink Delivery

Nib width is not just an aesthetic choice — it changes how much ink lands on the page per stroke. Broader nibs deposit significantly more ink, which amplifies every ink property: shading contrast deepens, shimmer particles become more visible, sheen surfaces become more reflective. The tradeoff is that broader nibs increase feathering risk on absorbent paper, because the paper's capillary system pulls excess ink laterally faster than it can absorb vertically. If feathering is a problem, dropping one nib size (or switching to a drier ink) often resolves it without changing pens.

Steel vs. Gold Nibs: What Actually Differs

Gold nibs are frequently described as "better" without explanation. The reality is more specific.

Gold is softer than austenitic stainless steel, which means gold nib tines spread more readily under writing pressure. This produces line variation — thicker downstrokes when you press, thinner strokes when you ease off. The flex is a direct consequence of the base metal's softness, not of tipping material or nib shape.

The gold alloy grade matters for how much flex you get. 14-karat gold (58% gold, rest alloy metals) is stiffer and more durable than 18-karat gold (75% gold). More gold means more softness; more alloy means more rigidity. This is counterintuitive — the "purer" gold nib is more flexible, not stronger.

Gold's softness is also a liability. Heavy or repeated flexing can permanently splay the tines or create a rounded, non-uniform writing surface at the tip — a condition called "baby bottom" wear. This damage is difficult to reverse.

Smoothness is the other common gold-nib claim — and it is largely a myth at the base-metal level. What determines writing smoothness is the quality and polish of the tipping material: the small hard-facing bead welded to the nib tip (roughly 1 mm across) that actually contacts paper. A well-tuned steel nib can match or exceed a gold nib in smoothness when both have identical tipping and polishing. The base metal is nearly irrelevant to how smooth the pen feels on paper.

The "Iridium" Naming Myth

You will encounter the term "iridium-tipped" on almost every fountain pen description. Modern fountain pen tipping contains little to no actual iridium. Manufacturers use tungsten, rhenium, osmium, or cermet (ceramic-metal) composite alloys instead — iridium's scarcity and cost make it impractical for mass production. The word "iridium" has become genericized marketing terminology.

"Iridium-tipped" tells you almost nothing about what is actually on the nib. Ask instead about tipping quality and surface polish — those are the variables that affect your writing experience.

Ballpoint and Gel Pen Mechanics

Ballpoints and gel pens do not have feeds or slits — their mechanisms are architecturally different.

A ballpoint uses a hardened ball (0.4–1.6 mm, typically tungsten carbide) seated in a precisely machined socket. The socket must be tight enough to prevent leakage yet loose enough for the ball to rotate freely. As the pen moves across paper, the ball spins continuously, presenting a fresh ink-coated surface with each rotation. This is what gives ballpoints their characteristic consistent line — there is no capillary slit to clog or misalign.

Ballpoint ink is oil-based with high viscosity (25–40% dye or pigment in oils and fatty acids). This requires more writing pressure than water-based pens, but the oil formulation means the ink dries nearly instantaneously and the pen resists drying out even when left uncapped for months.

Gel pens use a water-based gel matrix with pigment suspension. The formulation is less viscous than ballpoint ink, which means a smoother, lighter writing feel. Gel ink dries faster than rollerball ink, reducing smudging when the hand follows close behind the tip — relevant for left-handed writers.

Fig 2

Dip Pens

A dip pen is structurally the simplest writing instrument: an interchangeable metal nib pressed into a holder, dipped directly into an ink well. The nib holds only a few words' worth of ink and must be re-dipped frequently. This is a workflow constraint, not a flaw — dip pens give access to any ink (including drawing inks and acrylics that would destroy a fountain pen), and the ability to swap nibs mid-session makes them the preferred tool for calligraphy practice.

Line variation in dip pen writing comes directly from pressure: light pressure produces thin lines, heavier pressure spreads the tines and produces thick lines. Flex nib selection is matched to script style: Copperplate and Engrosser's scripts require highly flexible nibs like the Gillott 303, while Spencerian uses stiffer nibs (like the Nikko G) because only select strokes receive stress.

For slanted scripts, the oblique penholder is standard: a metal flange angled at roughly 45 degrees positions the nib obliquely relative to the hand, allowing natural arm movement while maintaining consistent script slant.

Step-by-Step Procedure: Basic Fountain Pen Maintenance

Maintenance is where most new fountain pen owners lose confidence. The process is straightforward once you understand the sequence.

Routine Cleaning

Regular cleaning prevents ink buildup in the feed channels, which is the primary cause of flow problems. For standard inks, a full flush every 4–6 weeks is sufficient. For iron gall inks, which contain iron sulfate that can corrode steel nibs and feeds, clean every 4 weeks without exception.

Steps:

1. Remove the cartridge or converter. Disassemble the pen to nib-and-feed unit if possible.
2. Hold the nib under a slow stream of cool water. Let the water run clear.
3. For stubborn buildup: soak the nib and feed in a cup of cool water for 20–30 minutes.
4. Dry with a soft cloth. Do not use heat.
5. Before refilling, confirm the nib slit is clear by holding it up to light — you should see a uniform gap.

Never use hot water, bleach, or alcohol-based solvents. These damage seals, rubber sacs, and feed materials.

Nib Inspection and Tuning

Effective nib tuning follows a fixed three-step sequence: inspect, align, polish — in that order. Skipping or reversing steps risks permanent damage.

Step 1 — Inspect

Use a 10x loupe or a macro phone photo. Look for:

• Tine misalignment (one tine higher than the other when viewed from the front)
• Asymmetric tipping (the hard bead at the tip is off-center or uneven)
• Surface scratches on the tipping

Step 2 — Align

Misaligned tines catch on paper fibers and produce a scratchy, inconsistent feel. To correct:

• Hold the nib securely, facing you.
• Use a fingernail or a smooth wooden tool (never metal) to gently press the higher tine down until both tines are level.
• Recheck under magnification after each adjustment.

Stop immediately if you feel resistance. Gold nibs can permanently deform. Steel nibs are more forgiving but not indestructible.

Step 3 — Polish

Progressive polishing uses grit sequences to remove surface irregularities from the tipping:

Stage	Abrasive	Purpose
1	4,000-grit (or Micro-Mesh 4000)	Remove scratches
2	8,000-grit	Smooth surface
3	12,000-grit (or Mylar 0.3 µm)	Final polish

Write a few figure-eights on each grit sheet, then test on paper. Use light pressure throughout. Test frequently — it is easy to remove too much material.

Common Misconceptions

"Gold nibs write smoother than steel nibs." Not inherently. Smoothness depends on the tipping material and its surface polish, not on the base metal. A well-tuned steel nib with quality tipping can write as smooth as any gold nib. What gold genuinely offers is natural flexibility, not intrinsic smoothness.

"The pen says 'iridium-tipped' so it has iridium on the nib." Modern "iridium" tipping rarely contains any actual iridium. The term is a historical genericized trademark. Manufacturers use tungsten, rhenium, osmium, or cermet alloys because iridium is scarce and expensive. The word on the packaging tells you nothing reliable about the tipping composition.

"A higher gold karat means a better nib." Higher karats mean more gold content, which means more softness, not higher quality. An 18k nib is more flexible and more prone to deformation than a 14k nib. Whether that is "better" depends entirely on what you are writing and how hard you press.

"My new dip pen is broken — ink won't stick." New dip nibs ship coated in a protective oil. The ink is not failing; the nib is not ready. Prep the nib first.

"A scratchy nib means a bad pen." A scratchy nib often means a misaligned tine or unpolished tipping — both fixable in minutes. This is especially common with budget pens that receive less quality control at the factory. The pen body and mechanism may be perfectly functional; only the nib finish needs attention.