I got a bottle of Maureen from Cult Pens...and there was no red sheen to it, even under a loupe.
Cult Pens have sent me a new bottle and have behaved impeccably. Their customer service is exemplary. However, the reality of the ink is somewhat less spectacular than the samples above.
I am using it in a Lamy 2000 which folks will know is quite a firehose when it comes to putting down ink. It might be that I am using some cheap paper and Cult Pens do warn about the performance of the ink on certain papers but I am to be honest underwhelmed by its performance. If you look at the link we were given above https://nickstewart....extreme-sheens/ and scroll down to the writing specimens. That is more the reality of the ink than the colour splits in the artwork above. And so far , I am not getting the colour that Nick has in his writing specimen. The iridescent has to come to the surface I think.
I have the Diamine "Blue Pearl" shimmer ink which is a great performer on any paper.
I will press on using some other paper but thus far I am underwhelmed.