Spectrum NoirAquaBlend Pencils: Essentials. Spectrum AquaBlend's rich pigment formulating gives you the performance of artist's watercolor in a pencil. They are fully watersoluble for unsurpassed blending and coverage with no staining or residue. Ideal for use at home, in the studio or for sketching on the go! This package contains twentyfour watercolor pencils in assorted colors within one 73/4x91/4x5/8 inch tin case. Conforms to ASTM D4236. Imported.