Can you use it in a fountain pen?

Do not use this ink in a fountain pen. This ink has pigments - think of tiny granules of pigment suspended in water. Those granules will clog a fountain pen feed over time. True fountain pen inks have no floating particles. This ink is for dip pens (no ink reservoir, just dip and write) or brush painting only.

Can this be used on smooth bristol paper? I read that sumi ink only adheres to rice paper, but I'm not sure about the validity of that claim.

Well, I've used it on smooth bristol paper, as well as a number of other types of paper and had no problems at all when it comes to the ink adhering to any of them.

Can i put this in a bingo dabber ? and use for poster boards? also if i paint over it would it seep through ?

I wouldn't put it in a dabber for Bingo. It's Chinese liquid stick ink. You want something that is water soluble. Depending on the paint over ink, it might seep through. Mainly a calligraphy/drawing ink.

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Yasutomo Black Sumi Ink (Bokuju) 12 oz.

Product ID: 4099838

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Details

Brand
Yasutomo
Package Information
Bottle
Paint Type
Oil
Item Volume
354.88
Global Trade Identification Number

⏳Lightfast for lasting brilliance

💧Waterproof finish

🖤100% pure vegetable soot

Description

🖤 Ink your legacy with timeless black brilliance!

GENEROUS VOLUME - 12 oz bottle designed to fuel your creative flow without constant refills.
PURE POWERFUL - Crafted from premium vegetable soot for the deepest, richest black.
WATERPROOF WONDER - Creates smudge-proof, waterproof strokes that stand out in any medium.
EFFORTLESS ELEGANCE - Skip the grind—ready-to-use liquid sumi ink saves you time and hassle.
FADE RESISTANT MASTERY - Lightfast formula ensures your artwork stays vibrant over time.

Yasutomo Black Sumi Ink (Bokuju) is a 12 oz bottle of premium liquid sumi ink made from high-quality vegetable soot. It offers a rich, deep black color that is both lightfast and waterproof, eliminating the need for traditional ink stick grinding and providing a convenient, economical solution for artists and calligraphers.

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