Waterman 1.7 oz Ink Bottle for Fountain Pens, Tender Purple (S0110750) - Walmart.com
Ink Review: Waterman Tender Purple - The Well-Appointed Desk
Another purple update, specifically comparing Waterman Tender Purple to Montblanc Psychedelic Purple and incorporating your other suggestions. Waterman is darn close IRL! I used some natural sunlight to get the closest representation