Can pen water be used as ink? Brush calligraphy

Yes, but the effect is not good, the ink is not volatile, and it won't take long to write with a brush.

Ink is used for writing brush strokes or painting, and ink is used for pens. They are not only different in composition, but also in usage. Ink is a black block made of soot or pine smoke, or juice made of ink and water. On the other hand, carbon ink is made of graphite particles mainly composed of carbon molecules. Ink dries easily, but carbon ink is not suitable.