I LOVE these! I bought the blue quite awhile ago, just to test the pen and see
if they really worked. I wound up being so happy with the performance that I
bought the whole set!
Don't dry too long, just like another reviewer said. It will make the ink
crumbly and it will shrivel up. I wrote with the blue one in a handmade book I
made for someone - and many, many months later, it's still pretty dimensional.
That's after having the book closed tightly for all this time.
I feel comfortable recommending these - they are totally different than "normal"
pens - and the ones I've received haven't had any flaws. They're grreeaat! :)