Say what you want about Montblanc "precious resin" but as my usage patterns have changed, I learned something about it that I didn't know before. I didn't know it because previously, I'd invariably clean out a pen within a month or two of filling it. But lately, as I've pursued other interests, I've had 8 or so fountain pens inked for long periods of time, including one of my favorite pens, a Montblanc 146 from the 1980's. I filled this thing up with Montblanc Lavender Purple sometime last December, give or take, and as I've used it from time to time, I've noted how slow the rate of evaporation has been. Obviously this plastic, while perhaps not able to survive a fall without breaking (so I'm told), has very low water vapor permeability. What's more, the thing has started up immediately every time I've used it. I just cleaned it out today. I was expecting a lengthy cleaning effort, but in fact it was really easy to clean out. I just flushed it half-dozen times or so at the sink at work, loaded it with water and put it back in my pocket, then later in the evening when at home flushed it a few more times. When I ran it with the nib and feed immersed in the ultrasonic cleaner, very little ink was left. So, if you ask me, it's a great pen and a great ink. Can't say how Montblanc is making pens these days, but apparently in the 80's they knew how to do it.
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