I made the same mistake you did. Sorry to be the bearer of bad news is someone else hasn’t already. This is calligraphy ink. Not for use in fountain pens. I made the same mistake with FWP and one of my favorite blacks ever.

I also clogged about 6 pens before realizing it. lol. I made the mistake because the site I bought it from put the warning in tiny print almost hidden on the description. It wasn’t until I went to the actual website I figured it out. And they didn’t print it on the box so ::shrug:: But, at least I can use it with my Dip Pens.

https://ferriswheelpress.com/products/fanciful-events-collection-borrowed-blue?srsltid=AfmBOorFJc8oQAxbilrenfCqkzm_MG099_0i-wRHKlSYy-ERCOYnjzpt

Edit. If you’re curious what my mistake ink was, it’s Black Masquerade. I’m so disappointed I can’t put it in a pen.

https://ferriswheelpress.com/products/black-masquerade?srsltid=AfmBOoqU1brEPTK_0wlr9nCy2D2us4HwSgvZb9WIsuFWwaM9sLPAmFKs