Will this work with the Pilot Metropolitan fountain pen?

It works perfectly even with the original refillable cartridge that came attached to the pen already. However, since the cartridge is not see-through then having a Con40 cartridge might be of interest to you.

What is the difference between "Mystery Black" and "Permanent Black" (both by Montblanc) ?

If you zoom in on the product photos, “Mystery Black” has a slightly purplish tint to it, side by side with the more colorless Permanent Black. Once you fill a page with writing, or if you are writing on the same page next to someone else’s pen scrawls, the difference gives Mystery Black a bit of uniqueness… but it’s subtle enough that both would look pure black in an incandescent (warm white) light. If water or rain are a concern, the mystery black is water soluble, while permanent ink doesn’t dissolve in water… it dissolves in alcohol (like a Sharpie).

How fresh/new is your bottled fountain pen ink refill? Read where the ink has a five year shelf life

Keep the cap on the bottle tight when not in use and it should last for decades. You will use it up or drop the bottle before it goes "bad". What is bad? Keep the ink in your pen fresh. Rinse your pen several times with warm, clean water when you get ready to refill. Keeping your pen filled and clean is far more important.

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🖋️ Write Like You Mean It — Ink That Commands Attention

NO MORE SMUDGES - Fast-drying formula ensures your documents stay crisp and clean—no waiting required.
EFFORTLESS REFILLS - Innovative inkwell design gathers remaining ink for smooth, mess-free pen dipping.
GIFT READY ELEGANCE - Encased in a sleek glass bottle with a sophisticated gift box—perfect for the discerning professional.
ENGINEERED FOR PRECISION - Specially crafted to prevent clogging, keeping your fountain pen’s nib flawless.
ELEVATE YOUR WRITING GAME - Royal Blue ink adds a timeless noblesse and classical refinement to every stroke.

Montblanc’s Royal Blue Ink Bottle (60ml) offers a premium, fast-drying, and clog-resistant refill solution designed specifically for Montblanc fountain pens. Its elegant glass bottle and innovative design ensure effortless refills while delivering a rich, classical blue hue that elevates any professional’s writing experience.

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Manufacturer	Montblanc
Brand	MONTBLANC
Model Number	105192
Product Dimensions	15.49 x 0.95 x 0.95 cm; 226.8 g
Colour	Royal Blue
Material Type	Glass
Number of Items	1
Size	60 ml
Point Type	Fine
Ink Colour	Blue
Manufacturer Part Number	105192
Item Weight	227 g

Montblanc Ink Bottle Royal Blue 105192 – Bottled Refill Ink in Blue for Fountain Pens – High Quality and Quick-Drying – 60ml

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