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本文は英語です。タイトルは各言語、本文は当面英語のみです。
Three different complaints
Fountain pen people often say this paper is bad when they mean three different things. Feathering blurs the edge of a stroke. Bleed pushes ink through to the back or the next sheet. Show-through lets you see writing from the reverse without wet ink passing through. Naming the fault points to the fix.
Feathering
Feathering happens when ink wicks along fibers faster than it sits on the surface. Thirsty, unsized sheets feather easily, especially under wet nibs and saturated inks. A finer, drier nib can reduce feathers on mediocre paper. Better sizing fixes the paper side of the problem.
If only one ink feathers on a pad that otherwise behaves, retire that ink from that pad. Ink and paper pair.
Bleed
Bleed is a wetting-through failure. Wide stubs, very wet piston pens, and heavily saturated inks find weak spots. Thick paper helps but does not guarantee safety. Coating and sizing matter as much as weight.
Test with your wettest setup. If the back spots, either change paper, reduce wetness, or write single-sided.
Show-through
Show-through is often acceptable. Thin Japanese notebooks may show ghosts of the previous page while still holding a crisp line. If double-sided notes matter, prefer denser or better-opacity stock. If you mostly scan or photograph pages, mild show-through may not matter.
Do not confuse show-through with bleed. Ghosts that are dry are not the same as wet marks on the reverse.
Matching wetness to paper
Wet nib plus thirsty paper is the classic failure pair. Dry fine plus coated paper can feel scratchy or rail. Move one variable at a time. Keep a note of winning triples: pen, ink, paper.
Left-handed writers should include drying time in the test. A paper that never bleeds but stays wet for a long time can still smudge a pushing hand.
Practical triage
For a notebook you already own: demote feathering pages to pencil or fine dry ink; keep your best paper for wide nibs and shading inks. For a notebook you have not bought: demand a one-minute test or a return path.
Bleed, feathering, and show-through stop being mysterious once you name them. After that, shopping becomes matching, not guessing.
Why wetness multiplies faults
A wet nib lays down more liquid. More liquid finds more paths through weak sizing. That is why the same pad can look perfect with a dry extra-fine and messy with a juicy stub. When people say a paper failed, ask which pen and ink they used.
If you love wet nibs, budget for better paper. If you love inexpensive pads, choose drier nibs and gentler inks. Both choices are valid. The mismatch is what frustrates.
Fixing a notebook that disappointed you
Already bought a pretty notebook that feathers? Demote it. Use it for pencil, ballpoint, or dry fine nibs with mild ink. Or keep it for lists. Not every notebook must carry your widest nib. Matching task to paper rescues purchases without guilt.
Finding better paper after a bad pad
When a notebook feathers, move wet nibs to better-sized paper rather than blaming the pen alone. Specialty shops can recommend fountain-pen pads. For a quick browse of common options, see Amazon search results for fountain pen friendly paper and Rhodia notepad. Test before you fill a whole journal.