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I have purchased these pens in black before in a 2 pack of the same brand to try before I bought this 12 pack of purple pens.
These are writing terribly compared to the 2 pack I bought. They seem to write fine for a few days and then start to dry out or something. The writing goes spotty in some places and isn't a consistent stream of ink and seems to drag as well. This has happened with at least 2 of the pens so far. I'm not sure maybe if they have just been sitting in inventory for too long, but I'm not overly satisfied at all with this particular purchase.
I included a picture. The top writing is when I started using it and the bottom is after a few days.