I'm currently reviewing some of my favourite Diamine inks. This is Diamine Amazing Amethyst. Water test on the review form shows this isn't a waterproof ink, but it's more resistant than some.Bearing in mind the paper I use is very smooth, this ink takes longer to dry than some others.It flows very well and lubricates the nib very well. No start-up problems noticed.It is currently available in 30ml plastic bottles and 80ml glass bottles.Diamine sell it directly to end-users on their web-site.It's reasonably priced.