Is the ink waterproof? I'd like to,use with watercolor.

I did a waterproof test, and if you let it dry completely for a period of time, it is. If water gets on the ink fairly soon after applied, it does bleed a little bit.

Is this pen refillable?

Yes, you can buy refill cartridges. It seems you can also use an ink syringe to refill, but I haven't looked into that.

Yes, you can buy refill ink cartridges. The grey part of the pen is the cartridge. The refill cartridges are sold on amazon.

Does anyone know what this sort of ink is? it dries with such a matte finish that i assumed it was india or sumi, but i'm not quite sure.

Absolutely NOT India ink. That will clog the pen. Use a good pigment ink like Pilot Yama Guri or Platinum Carbon. Glitter ink would also be a problem.

Manufacturer	Pentel
Brand	Pentel
Model number	XFP5F
Product Dimensions	23.01 x 3.51 x 1.5 cm; 9 g
Color	Inchiostro Pigmenti
Closure	Click-Off Cap
Grip Type	Ergonomic Grip
Pencil Lead Degree (Hardness)	F
Material Type	Plastic
Number of Items	1
Size	1 count (Pack of 1)
Point Type	Fine
Line Size	0.3mm
Ink Color	Black
Manufacturer Part Number	XFP5F
Item Weight	9 g

Pentel Pigment Ink Brush Pen - Extra Fine

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