This blue-black ink is a beautiful color that clearly shows the difference from black. It's easy on the eyes and feels good to write with. I've also included a comparison of the colors written with my own pen (using a 0.5mm nib). The paper used is Muji's high-quality paper slim notebook (plain), and the photos were taken indoors in natural light. Sorry, but I can't offer a discount. I will ship via Nekopos Mercari delivery service.