How do you refill the marker?

This is just a refill. But if you have the fat pilot marker, the top of the marker twists off.

Can I fill a fountain pen with this?

A bad idea. This is solvent-based. Fountain pen ink is water based. Fountain pen ink is dirt cheap. A small bottle lasts for a long time. Just buy fountain pen ink not this. (And ink jet ink? NO. Another really bad idea, for the same reasons.)

can this be used in brush pens?

Only a person who has your brush pens would know. But you do, so is the ink in your brush marker just like permanent markers? The other answer (about clogging) makes no sense. Permanent marker ink is a dye, not a pigment. So it's a fluid, which won't clog anything. (A pigment is tiny particles, so it might clog something, but permanent marked ink contains no pigment, so no clogging.)

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🖊️ Refill your mark, own your permanence.

TRUSTED LEGACY - Backed by Pilot’s 100+ years of precision pen craftsmanship and innovation.
VERSATILE BLACK - Deep, rich black ink perfect for art, crafts, scrapbooking, and professional marking needs.
ECO SMART REFILL - Sustain your style and reduce waste with a 30ml refill designed for Pilot Jumbo Permanent Markers.
LOW ODOR FORMULA - Enjoy a xylene-free, low-odor ink that’s office and studio friendly.
UNMATCHED PERMANENCE - Fast-drying ink that bonds permanently to glass, metal, wood, and plastic—no fading, no smudging.

The Pilot 43500 Ink Refill delivers 30ml of fast-drying, permanent black ink compatible with Pilot Jumbo Refillable Permanent Markers. Engineered for durability on multiple surfaces including glass, metal, wood, and plastic, this xylene-free formula ensures professional-grade, low-odor performance ideal for art, crafts, and office use.

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Brand	PILOT
Model Number	43500
Color	ブラック
Number of Items	1
Size	30 ml
Ink Color	ブラック
Product Dimensions	4 x 0.03 x 3 cm; 90.72 g
Application type	Art, Crafts, Scrapbooking

Pilot 43500 INK REFILL F/PERM MKRS BK

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