Boysenberry is from the Swift Formula collection where the inks were designed to be wetter than average and performs well in a wide variety of fountain pens. This ink is a medium purple with shading and no sheen.
The ink has a very wet flow. Due to the wetness of the ink, it will perform well on some papers and worse on others. I think the ink will be more suitable in drier nibs. On Mnemosyne, there is shading, no sheen, no feathering and a little bleedthrough.
This is written with a TWSBI ECO-T medium nib.
Disclaimer: This ink was purchased by me and all opinions/photos are my own. This post was not sponsored.