Rohrer & Klingner has recently released a "2018 limited edition" ink called Aubergine. As a big fan of their inks, I think they deserve more recognition for their wonderful inks. Solferino remains my top purple/magenta/violet ink with its retina-searing brightness and vibrancy. I've bought a bottle of this new Aubergine and I like it very much.
Aubergine comes in a cardboard tube packaging and their regular understated bottle. I like their bottles because they are functional. The ink itself is a low-key yet gorgeous purple that leans to the blue side but never so much as to become a blurple. It shows quite a lot of shading. A slight golden-red sheen could sometimes be observed but is really subtle. The inks writes very wet, and the lubrication is medium to good. It's not water resistant but it leaves a visible dark trace.
(Maruman loose leaf. I think it could be quite close to the non-accessible Sailor Pen & Message Sanyasou but with less sheen. However I don't have that one (sample) anymore for a comparison.)
(For my November "Clash of the colours" ink combo I matched up Aubergine and KWZI Menthol Green. I think a purple and a cyan-turquoise colour combo is quite ugly LOL. What do you think?)