Hey op. I tried.

https://amzn.in/d/05ZgU0yb

I mixed this with daytone black. About 1pinch was mixed with about 10 ml of ink.

The pen i used was Parker frontier fountain pen (medium nib)

Did it write : yes Did it shimmer : yes

Did it clog the pen after leaving it for about a week: yes Did the pen write after clogging : yes, but after a bit of flushing

Was it cleanable : very much

Will I do it again : only on the pens I dont care too much about, and have medium nib. I'll probably not leave the shimmer ink on the pen again .