30 PCS Asvine Hongdian Fountain Pen Ink Cartridges 6 Colors Set (Black, Blue, Green, Red, Purple, Light Blue), 3.4mm Bore Diameter

I bought these cartridges to use with my Hong Dian M2 fountain pen. Used a green cartridge first without problems. But when I wanted to use a light blue cartridge it would not click into the pen. I compared all the cartridge colours and discovered that the tops of the blue and light blue cartridges are different! The shape of the top is clearly different and there is a very slight difference in the height of the cartridges as well. This is clearly visible in the pictures. Obviously there was a problem with the production process. My pen came with a converter and I can transfer the ink, but I should not have to with cartridges that are meant to fit this specific brand and model pen. I won't buy them again.

Zgodnie z opisem produktu: 6 opakowań różnych kolorów po 5 wkładów do piór marki Hongdian.

Sinceramente ,crei que sería acuosa pero es consistente y colores definidos. Me ha gustado mucho aunque por otro lado debido a su especial boca y el tamaño que tiene, no hay más remedio que usarlos.

My pen used black ink previously, so the yellow mixed with that and became light green for one cartridge worth of ink. After that is became dark yellow, almost brown, and gradually lightened over time as the remnants of the black ink left the pen. That isn't the ink's fault, just something to think about. Overall this is good ink that flows well and fits the 3.4mm fitting snugly.

Buen artículo para la pluma fuerte