Here is a brief handwritten review of Diamine Majestic Purple Ink.
It is difficult to display the true color of this ink. It has a vibrancy to it but it is definitely not searing bright. It is a medium purple with pink undertones. (When diluted it is a pretty pink color.) I think it is a very nice medium purple and very easy to read.
As noted in my review, this ink appears much darker in a wetter pen (like the Ahab) as well with broader nibs (I have tried a stub 1.1 and 1.5)
More detailed photos are here: