Zest-it Pencil Blend is very popular for blending Coloured Pencils: how to use.
Zest It : Pencil Blend | Jackson's Art Supplies
Blending coloured pencils: pencil blenders and zest it pencil blend - YouTube
Zest-it Blending Sponge - For Blending Colouring Pencils & Pastels | eBay
Zest-It Pencil Blend for Coloured Pencils, Wax Pencils & Oil Pastels 125 ml | eBay
Jackson's Art - The smoothest shading results can be most easily achieved by using Zest-it Pencil Blend. It is a solvent that will break down the oil and wax content of pencils,
24 WAYS to Blend Colored Pencils – The Ultimate Blending Comparison
How To Blend Coloured Pencils: ZEST-IT Review & Demonstration - YouTube
Zest-it pencil blend | Product Review - STEP BY STEP ART