The pink cart reacts to one of my UV lights even through the bag and cartridge itself, so that's promising!
I've used the washable blue (my main ink for 30+ years), black, and red Parker Quink cartridges before. But I haven't ever tried the purple, pink, or turquoise. I'm eager to give those a shot!
I'm tempted to pop the cartridges, swatch, and then syringe the ink into other pens/converters. No time today, though.
