Lamy Zwarte T10 Vulpen Inktpatronen 4 Packs (LAM-T10-BLK4PAC)

I like to use a fountain pen and have bought a couple of Lamy ones to keep in different locations. These refills are inexpensive, they last a long time, the ink is nice and black, very easy to replace in the pens. I love the pens and these refills are perfect.

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These ink cartridges are easy to use. This ink is water soluble and will smear if if gets wet.

In the product description it is clearly mentioned that the cartridges are filled with the waterproof ink. I am an urban sketcher, I used this cartridge for sketching. While using water colours the ink dissolved in the colour and spoilt the whole sketch.Don't purchase if you need waterproof ink though Amazon mention it in the description.