J. Herbin has an ink with similar name (Bleu Myosotis) and sadly both are not that impressive.
One sentence for the ink conclusion: it’s blue. That’s all. Very similar to Parker Washable Blue and Pelikan 4001 Royal Blue. Slightly faster drying time (might due to dipping pen vs fountain pen, and it’s crazy hot in TW lately), saturated with some shading, wet ink flow, and didn’t bleed through iPaper UCCU or DoubleA. Seems like it has some water resistant but not much. It will be very hard to tell which is which if all the blues were put together without the names.
CP value: 75/100, not a very impressive blue.