The Writer's Lifestyle

Owning bottled ink opens a possibility that cartridges never do: you can mix your own colors. Not in a lab — in a small vial on your desk. A drop of Racing Green into Royal Blue produces a color that doesn't exist in any bottle. Twenty parts Mysterious Black to one part Oxblood Red makes a signature ink that's yours alone. This guide covers safe fountain pen ink mixing with the Wordsworth & Black bottled ink line — proven combinations, tested ratios, mixing technique, and (importantly) what not to mix. All five inks in our line share a compatible dye-based formulation, which makes them safe to mix with each other. Cross-brand mixing is where trouble usually starts. Key Takeaways All five inks in the Wordsworth & Black bottled ink line can be mixed safely with each other in any ratio — same dye-based formulation, no chemical conflicts Never mix across brands without testing first — different manufacturers use different surfactants and dye bases; incompatible mixes can gel, precipitate, or clog pens The three most-requested custom mixes: Midnight Storm (Royal Blue + Mysterious Black), Forest Twilight (Racing Green + Mysterious Black), and Autumn Rust (Oxblood Red + touch of black) Mix in a separate small vial, never in the original bottle. Test in a sacrificial pen for a week before committing your daily pen to the mix. Mixed inks store slightly less well than pure inks — plan to use custom mixes within 6–12 months rather than 3–5 years Why Mix Ink at All? Ink mixing is one of the small pleasures of bottled ink ownership. Three reasons it's worth learning: Custom Colors Five bottles of ink give you five colors. Mixing lets you create 15–20 usable additional shades — depth ranges, warmth variations, and colors that don't exist in commercial bottles. If you journal or write letters, a custom ink is a small form of personal branding. Extending Ink Life A bottle you no longer love (bought a color that doesn't work for you) becomes usable when mixed with a bottle you do love. The unloved bottle isn't wasted — it's a base for something new. Precision for Specific Uses Sometimes a specific writing context calls for a specific color the standard line doesn't quite match — a slightly warmer blue for holiday correspondence, a slightly darker green for editing marks. Mixing gets you there. The Basic Rules of Safe Mixing Rule 1: Same Brand Only (Safely) The safest ink mixing happens within a single brand's line. All five Wordsworth & Black bottled inks share a compatible dye-based formulation — mix any two, three, or four together in any ratio and the result is chemically safe. Cross-brand mixing works often but not always. Different manufacturers use different surfactants (the chemicals that let ink flow), different preservatives, and different dye bases. Some cross-brand combinations produce gel-like precipitates that permanently damage feed channels. Rule 2: Never Mix In the Original Bottle Always mix in a separate small container — a clean 5–10 mL glass vial, or even a well-rinsed prescription bottle. Reasons: Failed mixes don't ruin either source bottle You can adjust ratios by iterating without permanently affecting the base ink The mix is contained if it ever needs to be discarded Rule 3: Test in a Sacrificial Pen Never load a new custom mix into your daily pen immediately. Load it into a "test pen" (an old Crest or a spare fountain pen you don't mind flushing extensively) and use it for a week. Watch for: Consistent flow across the week No settling in the cartridge/converter Clean flushing at the end of the week No color shift (some mixes change subtly as they equilibrate) If any of these fail, discard the mix and reformulate. Rule 4: Document Your Ratios A great custom mix that you can't recreate is a lost mix. Keep a small notebook with mix formulas — "Midnight Storm: 20 drops Royal Blue + 5 drops Mysterious Black, tested Aug 2026, use within 12 months." The back page of a journal works for this. Our take: Most fountain pen owners never mix ink because they think it's complicated or risky. Within a single brand's line, it's neither — it's just a small experiment with your existing bottles. The first three custom mixes usually fail (that's the learning); by the fourth or fifth you have a color you'll keep for years. Proven Wordsworth & Black Mix Combinations These are the mixes we've tested and recommend across the Wordsworth & Black bottled ink line. Ratios are drop-based (from a standard eyedropper or the bottle's dropper cap) into a small mixing vial. Midnight Storm — Royal Blue + Mysterious Black Ratio: 20 drops Royal Blue + 5 drops Mysterious Black Character: A deep midnight blue that reads more serious than Royal Blue alone but warmer than pure Mysterious Black. Excellent for formal correspondence, professional signatures, and evening journaling. Best paired with: The Erudite Collection's Medium nib and cream-tinted letter paper. Forest Twilight — Racing Green + Mysterious Black Ratio: 15 drops Racing Green + 5 drops Mysterious Black Character: A very dark forest green that reads as neutral black in low light but reveals green depth in daylight. Best for people who want a "professional" ink that isn't quite black. Best paired with: Any pen from the Wordsworth & Black line; particularly striking in the Majesti Gold's 18K gilded nib. Autumn Rust — Oxblood Red + Touch of Black Ratio: 20 drops Oxblood Red + 2 drops Mysterious Black Character: A deep rust color, less bright than pure red, more distinctive than pure brown. Excellent for editing markup, personal letters, and journal accents. Best paired with: The Crest Set's Fine nib on cream paper — the darker red flows better than pure red on absorbent stock. Ocean Depth — Royal Blue + Racing Green Ratio: 15 drops Royal Blue + 8 drops Racing Green Character: A teal-adjacent color that leans blue-green. Distinctive without being unusual. Good for journaling when you want variety from pure blue-black routines. Best paired with: The Crest Set's Stub nib for maximum line-variation display. Warmer Blue — Royal Blue + Warm Secondary Ratio: 18 drops Royal Blue + 4 drops warm-color ink Character: Royal Blue with a warmth undertone. Reads professional but has a personal quality — good for client thank-you notes and personal letters. Best paired with: The Erudite Collection with a Medium nib on cream paper. Dark Forest — Racing Green + Extra Racing Green Ratio: Concentrate by letting a small amount of Racing Green evaporate slightly (leave the vial open for 24 hours, then re-cap). The remaining ink is more concentrated. Character: An even darker Racing Green than the base. Best for very expressive journaling or letters where you want the green to be unmissable. Caution: Evaporation-concentrated inks flow slightly slower. Test in a sacrificial pen; adjust with a drop of distilled water if flow is too dry. W&B Ink Mixing Combinations Tested Ink Mix Combinations Midnight Storm 20 Royal + 5 Black Forest Twilight 15 Green + 5 Black Autumn Rust 20 Red + 2 Black Ocean Depth 15 Royal + 8 Green Warmer Blue 18 Royal + 4 warm Ratios are drop-based; adjust to taste after testing in a sacrificial pen. Six proven Wordsworth & Black mix combinations. Start with a small batch (30–40 drops total) to test before committing more ink. What Not to Mix Never Mix With Non-Fountain-Pen Ink India ink, calligraphy ink, dip-pen ink, and drawing inks are not compatible with fountain pens. Adding any of these to fountain pen ink will contaminate the mix permanently and clog any pen it enters. Keep fountain pen ink completely separate from other ink types. Avoid Shimmer Inks in Mixes Shimmer inks (with suspended mica or metal particles) are difficult even alone. Mixing them dilutes the shimmer effect while retaining the maintenance burden. Not worth it. Avoid Iron-Gall Inks in Mixes Iron-gall inks have acidic bases that can react unpredictably with the dye bases in standard inks. Even if the mix seems fine initially, chemical changes can occur over weeks that damage feeds. Avoid Cross-Brand Mixing Without Testing Some cross-brand combinations work beautifully. Others produce sudden gel-like precipitates weeks after mixing. If you must mix across brands, always test extensively (multiple weeks in a sacrificial pen) before committing. Avoid Water Dilution Above 10% A drop of distilled water in a dry-flowing ink can improve flow slightly. More than 10% water dilution reduces the ink's saturation, changes drying time, and can trigger dye separation in the bottle over time. The Mixing Technique Equipment 5–10 mL glass vial with tight cap (repurposed prescription bottle works) Eyedropper or the built-in dropper cap on ink bottles Fine paper towel or lint-free cloth for cleanup A sacrificial pen — an old Crest or Erudite you're willing to flush extensively Notebook for ratio documentation Step-by-Step Rinse the mixing vial with distilled water and let dry completely. Any residue affects the mix. Count drops of the primary color into the vial (the base — usually the larger portion). Add the secondary color one drop at a time. Cap the vial and gently swirl (never shake — introduces air bubbles) between drops. Let the mix sit capped for 30 minutes. Chemical equilibration can slightly change the color from what you initially see. Draw a small amount into the sacrificial pen (fill the converter or use a syringe). Write a test line on quality paper. Evaluate color, flow, dry time. Adjust ratios if needed — add another drop of the secondary color for more depth, or the primary for less intensity. Once satisfied, mix a slightly larger batch (2–3× test volume) and load into a daily pen for a week of use. After a week of use, if flow and color remain stable, commit the mix to your rotation. Common Mixing Mistakes Adding too much of the secondary color at once — you can always add more, never remove. Go slow. Shaking instead of swirling — introduces air bubbles that affect flow when loaded into a pen. Evaluating color immediately — mixes need 30 minutes to fully equilibrate. Testing on cheap paper — the paper affects your color perception. Use the same paper you'll use in the final pen. Skipping the week-long test — subtle flow issues appear over days, not minutes. Storing Custom Mixes Storage Rules Tightly capped glass vial — plastic can leach over long-term storage Cool, dark place — same rules as commercial ink bottles Labeled with formula and mix date — future you will thank present you Shelf Life Custom mixes have shorter shelf lives than pure commercial inks. Plan for: 6–12 months for standard 2-ink mixes at typical ratios 3–6 months for 3+ ink mixes or mixes with unusual ratios Days to weeks for mixes with water dilution — use quickly, don't store long-term If a mix shows any of the standard bad-ink signs (mold, gel formation, sharp smell), discard and remix. Never load a suspect mix into a good pen. When to Mix (and When to Just Buy the Color) Mix When You want a specific color the commercial bottles don't quite match You have an unloved bottle you'd like to use up creatively You enjoy the experimental side of ink ownership You want a personal-branded ink for signatures or correspondence Just Buy When You want a color that already exists in the Wordsworth & Black bottled ink line You need reliability and long shelf life (mixed inks store shorter) You're new to fountain pens (learn commercial inks first, mix later) The mix ratio is complex or extreme (some effects are easier to buy than mix) Frequently Asked Questions Is ink mixing safe for my pen? Yes — within a single brand's line (like the Wordsworth & Black bottled ink line), mixing is chemically safe. The pens are designed to handle the same ink family regardless of specific color. Cross-brand mixing carries more risk and requires testing. How much ink should I mix at once? For a first test: 20–30 drops total (about 1–2 mL). Enough to fill a converter and test in a pen for a week. Only mix larger batches after confirming the mix works. Can I mix cartridge ink with bottled ink? Yes if both are from the same brand and share the same formulation. The Wordsworth & Black cartridges use the same ink formulation as the bottled inks, so mixing is safe — but pointless (you already have the bottled version of the same colors). What if a mix looks fine but starts skipping in the pen after a week? The mix is likely developing precipitates or the components are separating. Flush the pen immediately, discard the mix, and rethink the ratios. This is why the sacrificial-pen test week matters. Can I mix ink to match a specific color I've seen? Sometimes — but color matching is harder than it sounds. Start with the closest single color from the line and adjust with small amounts of the nearest complement. Perfect matches are rare; "close enough and I love it" mixes are common. Does mixing affect ink drying time? Yes, slightly. Mixes with more saturated components (adding Mysterious Black to lighter colors) dry slower. Mixes with lighter components (adding water or lighter inks) dry faster. Test on the paper you'll actually use to confirm dry time meets your needs. How do I know if a mix has gone bad? Same signs as any bad ink: visible mold, sharp ammonia smell, gel-like consistency, or unexplained skipping in a previously reliable pen. Discard immediately — don't try to recover a bad mix. Final Verdict Ink mixing is a small, low-risk pleasure that turns your existing ink bottles into a wider palette. Within the Wordsworth & Black bottled ink line, all mixes are chemically safe and only limited by your willingness to experiment. Start with one of the six proven combinations above — Midnight Storm is the most universally useful. Mix 20–30 drops in a small vial, test in a sacrificial pen for a week, and commit to your daily pen only after the mix proves stable. Document ratios as you go. The best custom mix you'll ever make is one you can recreate two years later. A single small notebook on the desk — or the back page of a journal — is enough infrastructure. The setup: 3 bottles from the Wordsworth & Black line ($39 total), a $5 pack of small glass vials, and one sacrificial pen (a spare Crest Set or older fountain pen). Under $75 for a complete ink-mixing setup that expands your usable color palette from 5 to 20+. → Shop the Wordsworth & Black Bottled Ink Collection