Is this a washable, non-staining blue?

I'm not sure what you mean by "washable" as I wouldn't consider any ink washable. If you're asking whether this ink will stain your demonstrator pens (like the infamous Noodler's Bay State Blue), it won't. I've used this ink (my favorite blue by the way) in my TWSBI ECO, TWSBI 580, and Pilot Custom Heritage 92 and have never had a problem with staining. It is not permanent on paper and will smear/run if exposed to water. Hope this helps.

Is this a washable, non-staining blue?

I highly doubt that it is washable or nonstaining, although Ive never tested that. This brand of ink offers vibrant colors that are pretty intense. It's my favorite ink by far, but I'm guessing it's pretty permanent.

How long does a bottle last?

That depends on how much you write. The bottle is 50ML and your average cartridge converter holds 0.8ML so figure 1ML per fill on by the time you wipe off your nib after filling I fill my pen on about 1 or two times a day. I tend to write a fair amount every day so a bottle of ink last me around a month and a half your mileage will vary depending on pen paper writing style etc.

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PILOT IROSHIZUKU KONPEKI JAPANESE INK

Product ID: 94568947

Details

Brand
Pilot
Global Trade Identification Number
Item Volume
50 Millilitres
Package Information
Bottle
Paint Type
Dye-based

🔵vibrant Konpeki blue

🖋️50ml premium bottle

🇯🇵authentic Japanese craftsmanship

S$44

Duties & taxes included

In stock

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Description

🔵 Write Bold. Write Brilliant. Write Konpeki.

ICONIC KONPEKI BLUE - Stand out with a deep, rich blue that commands attention.
ARTISTIC VERSATILITY - Perfectly suited for both professional writing and creative artwork.
TRUSTED JAPANESE QUALITY - Crafted in Japan for unmatched consistency and elegance.
HIGHLY RATED BY PROFESSIONALS - Join nearly 1,000 users who gave it a 4.8-star seal of approval.
ELEVATE YOUR WRITING EXPERIENCE - Unleash smooth, vivid strokes with every pen glide.

Pilot Iroshizuku Konpeki is a premium 50ml bottle of dye-based fountain pen ink from Japan, celebrated for its vibrant blue hue and smooth flow. Ideal for both writing and artistic expression, it’s a top-rated choice among discerning professionals seeking quality and style.

Specifications

ASIN	B0018HJVS6
Brand Name	Pilot
Container Type	Bottle
Country of Origin	Japan
Customer Reviews	4.8 4.8 out of 5 stars (987)
Display Volume	50 Millilitres
Global Trade Identification Number	04902505367281
Ink Colour	Blue
Item Weight	250 Grams
Manufacturer	Pilot
Manufacturer Part Number	暂无
Model number	INK-50-KO
Number Of Items	1
Paint Type	Dye-based

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Good experience, but the tracking updates could be better.

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