Definitions here are written for one purpose: to help you spot a defect and describe it accurately. If a term is debated in style communities, we pick the version that supports measurement and repeatable tests. That keeps the library calm and usable.
Image suggestion: macro photo of a shaded stroke with labels placed on a separate card (not over the image): “hairline,” “shade,” “exit stroke,” and “feathering edge.”
Railroading
A shaded stroke splits into two parallel lines with a pale channel between them. In practice, this is a sign of ink starvation at the tine gap. It often shows up on slow curves because the nib stays open longer and needs a steadier ink supply.
Diagnostic hint: check ink load and dilution first, then inspect tine alignment. Only after those are stable should you change pressure technique.
Feathering
Ink spreads into paper fibers and creates soft, fuzzy edges. The underlying cause is usually paper absorbency and sizing, but ink dilution can amplify it. A useful distinction: feathering is an edge behavior; blobs are volume and pooling behavior.
Diagnostic hint: swap to a known smooth, well-sized paper (even a single sheet) and repeat the same stroke set. If feathering disappears, paper was the primary variable.
Hairline recovery
What happens immediately after you release pressure. A clean recovery returns to a thin line without a “tail blob,” a notch, or an abrupt width change. This is a practical marker for pressure control and for whether the nib snaps back evenly.
Diagnostic hint: run a pressure ladder—five strokes, each with a slightly longer pressure phase—then compare the recovery points. If the recovery fails only at higher pressure, reduce spread and check tine symmetry.
Counter-space
The enclosed or implied “inside” space of a letterform. Consistent counter-space is what makes a word look even at a glance. In practice, you can compare counters as shapes rather than as distances: if two counters feel different, spacing will feel lumpy even if measurements look similar.
Diagnostic hint: mark tiny anchor points at the widest parts of common counters (o, a, d) and compare them across a word. This is faster than measuring every gap.
Baseline drift
When letterforms gradually rise or fall across a word or line, even when you intend to stay level. Drift is often subtle on single letters and obvious on long words. It is influenced by guideline visibility, arm movement, and where you “aim” your exit strokes.
Diagnostic hint: write a long word twice: once with strong baseline lines, once with a faint baseline. If drift increases on the faint line, the fix is visual structure before technique tweaks.