DERWENT-Inktense Pencils. Pure; vibrant watersoluble ink pencils that combine the intensity of pen and ink with the versatility of line and wash. Use them to create strong vivid tones then wash over with water for a translucent ink-like effect. Once dry; this color wash is permanent and can be worked again using other media. The possibilities are endless! This package contains twenty-four Inktense pencils in assorted colors. Conforms to ASTM D4236. Imported.