The COLORLESS BLENDER is a tool for creating your own colours and for lightening up work afterwards. Filled with colour-neutral alcohol, the ON THE RUN 830 Colorless Blender allows you to lighten the tone of any OTR Graphic Twin Marker or Artist Twin Marker until you reach the colour you want. This makes seamless colour gradients in a range of stroke widths easy. Local lightening up of marker drawings after they have been completed is also possible. Contours can be made softer and light reflexes may be added.