Diamine Aqua Lagoon is a medium turquoise that leans a little towards teal. It has an average flow. I like this colour, turquoise but not quite your typical turquoise, to keep it interesting to look at.
On Rhodia paper, there is shading, no sheen, no feathering and no bleedthrough.
This was written with a TWSBI ECO-T medium nib.
Below are a couple of photos of how it looks when it was 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.