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 Fountain Pen Ink – 50 ml Bottle – Kon-peki Deep Azure Blue (Japan Import)

Product ID: 1622788

Details

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

💧50 ml premium ink volume

🔵vibrant deep azure blue shade

🖋️smooth dye-based formula

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Description

🔵 Elevate your writing game with the iconic Kon-peki blue!

GENEROUS 50 ML BOTTLE - Long-lasting ink supply designed to keep your creativity flowing without interruption.
HIGHLY RATED BY USERS - Join thousands of satisfied users with a stellar 4.8-star rating—don’t miss out on the best.
ICONIC DEEP AZURE HUE - Stand out with the rich, captivating Kon-peki blue that elevates every stroke.
SMOOTH DYE BASED FORMULA - Experience flawless, consistent writing with ink engineered for premium fountain pens.
TRUSTED JAPANESE CRAFTSMANSHIP - Imported from Japan, a mark of quality and precision for discerning professionals.

Pilot Iroshizuku Kon-peki is a 50 ml bottle of premium dye-based fountain pen ink from Japan, offering a vibrant deep azure blue color. Renowned for its smooth flow and high-quality formulation, it is favored by professionals and enthusiasts alike, boasting a 4.8-star rating from nearly 1,000 users.

Specifications

ASIN	B0018HJVS6
Best Sellers Rank	#24,157 in Office Products ( See Top 100 in Office Products ) #19 in Bottled Pen Ink
Brand Name	PILOT
Container Type	Bottle
Customer Reviews	4.8 4.8 out of 5 stars (974)
Global Trade Identification Number	04902505367281
Ink Color	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
Unit Count	1.6907 Fluid Ounces
Volume	50 Milliliters

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