You can retain diluting approximately you'd like and it gives you as many tones you desire for your drawing. They don't dry out immediately if still left exposed right away. Of course, It's not necessarily advised to get it done, so make sure to cap them right after use. https://how-to-draw-with-ink-pens83603.activosblog.com/34990749/how-to-draw-with-ink-pens-fundamentals-explained