The other S. T. DuPont ink. I think they just released the ink for fun since they have the stationary line.
This black has a touch of yellow which is similar to The Bird’s Ink black but not the same. It is relatively darker than Pelikan 4001 Brilliant Black but still not dense enough as Sailor Kiwa-Guro. About the same drying time, between 10-15 seconds. Wet enough ink flow but won’t bleed through iPaper UCCU or DoubleA.
CP value: 70/100, just got it for collecting reason.