Can I use any ink in any fountain pen?

Use standard fountain pen ink only — never India ink, calligraphy dip ink, or pigment inks in demonstrators without frequent cleaning. Shimmer inks are fine but should be flushed weekly to avoid clogging the feed. Iron-gall and pigment inks are safe if you clean regularly.

How often should I clean my fountain pen?

Flush with cool water every 4 to 8 weeks with normal inks, or immediately when changing between very different colors. Pigment inks (Platinum Carbon Black) and iron-gall inks need cleaning roughly weekly. Never store a pen with dried ink for months, as it can permanently clog the feed.

Is bottled ink cheaper than cartridges?

Significantly. A $16 bottle of 80ml Diamine equals roughly 100 standard cartridges, which would cost $50 or more. You need a converter (about $6 to $12 one-time), after which bottled ink costs pennies per fill and gives you access to hundreds more colors.

By the Fountain Pen Gear Guide Editorial Team · 4 min read

Best fountain pen ink comparison — an honest buyer's guide

Ink is where the fountain pen hobby gets addictive — and expensive. A $12 bottle of Iroshizuku behaves nothing like a $8 bottle of Noodler's, and neither writes the same on cheap copy paper as it does on Tomoe River. This guide cuts through the marketing with real comparisons, concrete numbers, and gear recommendations that actually matter for beginners.

How to actually compare fountain pen inks

Forget vague terms like "vibrant" and "smooth." Four measurable properties tell you almost everything about how an ink will behave:

Flow/lubrication: Wet inks (Waterman Serenity Blue, Diamine Sargasso Sea) glide but can bleed. Dry inks (Pelikan 4001, Aurora Black) tame gushing pens.
Dry time: Ranges from ~3 seconds (dry inks on absorbent paper) to 30+ seconds (saturated inks on coated paper). Critical if you're left-handed.
Shading and sheen: Shading is light/dark tonal variation; sheen is a metallic secondary color. Diamine Ochre shades beautifully; Organics Studio Nitrogen sheens red.
Water resistance: Most inks smear when wet. Only iron-gall (KWZ IG Blue-Black) and pigment inks (Platinum Carbon Black) survive.

Test on the paper you actually use, with the pen you actually own. An ink is a system with paper and nib, not a standalone product.

Fountain pen ink comparison: standout picks by category

Best all-round starter ink

Waterman Serenity Blue ($11/50ml). Well-behaved, easy to clean, water-based, and forgiving on bad paper. If a pen skips with this ink, the pen is the problem.

Best value

Diamine ($8/30ml, $16/80ml). Over 100 colors, consistently good behavior, and cheap enough to experiment. Ochre, Oxblood, and Sherwood Green are hobby favorites.

Best premium

Pilot Iroshizuku ($28/50ml). Overpriced on paper, but the flow and color depth (Kon-peki, Yama-budo, Tsuki-yo) are genuinely a step above. Worth one bottle to understand the ceiling.

Best for document use

Platinum Carbon Black — pigment-based, archival, waterproof. Flush your pen weekly or it clogs; the tradeoff is signatures that survive coffee spills.

Best fountain pens for beginners (and cheap pens under $30)

You don't need to spend $150 to enjoy this hobby. These four cover nearly every beginner:

Pilot Metropolitan ($18): The default recommendation for a reason — a metal body, reliable medium/fine nib, and it comes with both a squeeze converter and a cartridge.
Lamy Safari ($25): Durable ABS body, easy grip section, swappable steel nibs (buy an extra fine or broad for $8). Slightly dry, pairs well with wet inks.
TWSBI Eco ($30): A piston-filler that holds ~2ml of ink — huge capacity, fully visible, superb nib. The best pen under $30, full stop.
Pilot Kakuno ($13): The cheapest genuinely good pen. Same nib as the Metropolitan in a plastic body with a smiley face on the nib.

Skip the $5 mystery pens on marketplaces. They write once, dry out, and put people off the hobby entirely.

Fountain pen converter guide: how to use bottled ink

A converter is a small piston mechanism that lets you fill from a bottle instead of buying cartridges. This is where bottled inks above come into play.

Which type do you need?

Screw-in piston converters (Lamy Z28, Pilot CON-40/CON-70) — pen-specific, so buy the one matched to your brand.
Standard international converters — fit any pen that takes standard international cartridges (Kaweco, TWSBI Swipe, most European pens).

How to fill without the mess

Submerge the nib past the breather hole, twist the piston down then fully up, then twist back a fraction of a turn to release a drop and clear the seal. Wipe the nib. Expect the CON-40 to hold only ~0.5ml — small, so refill often.

Best paper for fountain pens

Paper matters more than most beginners realize. Standard 75gsm office copy paper feathers (ink spreads along fibers) and bleeds through with wet inks. Good fountain pen paper is coated or tightly calendered to keep ink on the surface.

Tomoe River 52gsm: Almost tissue-thin yet zero feathering; maximizes sheen and shading. Long dry times.
Rhodia / Clairefontaine 90gsm: The reliable daily driver. Smooth, bright white, minimal show-through.
Leuchtturm1917 80gsm: Popular for bullet journaling; handles most inks but wet ones ghost slightly.
Midori MD 80gsm: Warm cream tone, excellent feedback, great for daily writing.

Budget tip: HP Premium 32 (32lb / 120gsm) copy paper is cheap, widely available, and handles fountain pens surprisingly well for printing and drafts.

The takeaway

Start with a Pilot Metropolitan or TWSBI Eco, a bottle of Waterman Serenity Blue or Diamine, a matched converter, and a Rhodia pad. That's a complete, forgiving setup for under $60 that will show you whether the hobby clicks. Chase premium inks and Tomoe River paper later — once you know your own preferences, every upgrade becomes obvious. The most common beginner mistake isn't buying the wrong pen; it's judging a great pen on terrible paper.