Tchaikovsky by Noodler's ink is part of their Russian series. I couldn't find out why they associate Tchaikovsky with purple, Diamine has a blue Tchaikovsky ink, but having an ink named after you is a great tribute in almost any color.
Being a purple ink this ink is useful only for personal use of course and should be kept far from the office. The most striking think about this ink is the HUGE difference between a dip pen (1mm OB nib) and a regular nib on a Parker Sonnet. The color changes from a lowly saturated, bland purple into a well-shaded deep purple.
The ink itself is a typical Noodler's ink. It does what it has to do, no-frills. The color is neither ugly nor beautiful, the bottle is chock-full (careful), the ink dries quickly enough and it behaves decently in almost every pen and on every paper. Plus, it's not very expensive. Show through is minimal, shading is low, water resistance is high.
The dip pen was a surprise, and so was comparing it to other inks. Based on the bottle I thought it was quite similar to Herbin's Poussiere de Lune. The q-tip swab shows it's not. It's more blueish and paler. Lavender Purple is very different, that wasn't a surprise and so is larme de cassis.
I will probably use this ink more often... but it will be with a dip pen with a broad (oblique) nib!
Written on Original Crown Mill Vellum paper