Birmingham Pen Company is a small family-run business that makes fountain pens and fountain pen inks. While the company started with fountain pens, it seemed their focus is now on inks.
Glassmith is part of the Crisp Formula collection where the inks were designed to work well on a variety of papers. This ink is a medium teal with an average flow.
On Leuchtturm1917 paper, there is shading, no sheen, a little feathering and some bleedthrough.
This is written with a TWSBI ECO-T medium nib.
Below are a couple of photos of how it looks when it is written on both sides of the paper.
Disclaimer: This ink was purchased by me and all opinions/photos are my own. This post was not sponsored.