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Earlier in March I wrote about "Saving Those Fiber-Tipped Calligraphy Pens Even When They Are Running Out of Ink."
I promised to show you another face sketch where I used an almost dried out pen. Here it is. If you look at the enlargement you'll see that the pen starts to give off a lovely, almost "graphite" quality when you shade with it at this point in its life. (The coquille paper just enhances this, but the effect is visible on any paper you elect to use.)
So even if your F-CPAC pens are drying out, save them. You can sketch with one for a little bit, switch to another, then switch back to the first which will have had some time to "recuperate." And so on throughout the sketch. There's a lot of fun left to be had in that pen!!