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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Manufacturer	Pilot
Brand	PILOT
Item Weight	8.8 ounces
Product Dimensions	3.74 x 3.35 x 1.5 inches
Item model number	INK-50-KO
Is Discontinued By Manufacturer	No
Color	Blue
Number of Items	1
Size	1.7 fl oz
Ink Color	Blue
Manufacturer Part Number	暂无

PILOT インキマンネンヒツインキ 50ML KO コンペキ INK50KO

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