Derwent Blender Pencil.
Blend colours together easily. If you are working with coloured pencils and want to create a subtle blend of colours then the Derwent Blender Pencil is the ideal accessory.
It is a soft colourless pencil made from the binder used for making coloured pencils and allows you to blend two or more colours together to create a new colour.
At the same time it physically mixes and smoothes the colours so individual strokes and hard edges are softened.