Start with your hand, not the shelf

Most of us choose a pen the way we choose a birthday card: quickly, near the till, on the way to something else. Then we wonder why a long letter leaves our fingers cramped and our handwriting ragged by the second page. The pen that suits you is rarely the one that happened to be in reach. It is the one that lets your hand stay loose while the words arrive at a steady pace.

Comfort comes down to two things: how much pressure you need to make a mark, and how tightly you have to grip to control the pen. A smooth-flowing nib reduces both. That matters far more than the name printed on the barrel, and it is something you can only judge by writing a few hundred words, not by scribbling your signature on a shop counter.

Nib sizes: find your everyday width

Nib sizes are usually given in millimetres for rollerballs and gel pens, and in grades for fountain pens. Japanese and European grades are not identical — a Japanese fine is noticeably finer than a European fine — so treat the numbers as a starting point rather than gospel.

• Fine (roughly 0.4–0.6mm) — ideal if your handwriting is small, if you write in planners and forms, or if you are left-handed and prone to smudging. It is economical with ink but can feel scratchy on cheap card.
• Medium (roughly 0.7–0.9mm) — the comfortable all-rounder for letters, journal entries and card messages. Enough line width to look generous, enough control to stay legible at speed.
• Broad or stub (1.0mm and above) — lovely for short messages, place cards and signatures, where the line variation does the decorative work. Less lovely for a four-page letter, when the extra ink and wider movement tire the hand.

If you write for more than ten minutes at a stretch, medium is usually the safest home. Keep one fine pen for small-format work and one broad or stub for occasions, rather than asking a single nib to do everything.

Ink colours that behave themselves

Colour is where personal taste meets practicality. A warm mid-blue or blue-black reads as personal without being fussy, and it photocopies well if you are sending anything official. Sepia, teal, burgundy and warm grey feel more like a letter and less like a form, though paler inks can look faint in low light.

• Dye-based inks flow generously and dry relatively quickly, which suits absorbent notepaper and quick card notes.
• Pigment and waterproof inks are more permanent and resist smudging from damp fingers, but they need more careful cleaning and can clog a pen left unused for weeks.
• Wet, saturated inks look rich but take longer to dry; on glossy or coated cards they can sit on the surface and smear long after you have written.

For cards especially, choose a quicker-drying ink and give each line a moment before closing the flap. A smeared greeting is a small heartbreak.

Paper and cards change everything

The same pen can feel silky on one surface and scratchy on another. Coated or photographic card stock repels ink, so fine nibs and dry inks struggle there; a medium rollerball or gel pen usually copes better. Uncoated, textured card drinks ink and can cause feathering, where lines blur at the edges.

Look for greetings cards around 250–300gsm with a lightly textured, uncoated finish if you plan to write a proper message. For letters, 90–120gsm paper gives a pleasant amount of resistance without bleeding through to the reverse. Keep a sheet of blotting paper in your writing folder — it is old-fashioned, cheap and quietly brilliant.

How to test before you commit

Give yourself a fortnight rather than an afternoon. Buy or borrow three or four pens in different widths and ink colours, then use each one for real writing: a shopping list, a thank-you note, a two-page letter.

• Write at least a page with each candidate before deciding; fatigue shows up late, not early.
• Notice your grip. If your knuckles ache or you keep pressing hard, the pen is fighting you.
• Test each pen on the paper and cards you actually use, not on a shop's sample pad.
• Check drying time by writing a line, waiting ten seconds, then running your thumb across it.

Whichever pen leaves your hand relaxed and your writing unchanged from first line to last is the one to keep.

Build a small, dependable kit

You do not need a drawer of pens. Two or three well-chosen ones will cover nearly everything: a medium-nib workhorse for letters and journals, a fine pen for small writing and envelopes, and something broader or more colourful for cards and signatures. Add a refill or a spare cartridge, a couple of ink colours you genuinely enjoy, and a notebook that matches your favourite nib's appetite for ink.

Handwritten correspondence should feel like a pleasure rather than an effort. Get the pen and ink right, and the writing takes care of itself.