Dove Blender Pen Blending Medium Refill BL-R. The Dove Blender Solution is a revolutionary blending medium, specially formulated to make “floating” or blending colors easier. Works great with all waterbase markers, colored pencils, chalks, dye ink pads and pigment ink pads. Use this solution to refill Dove’s Blender Pens BL-3 711583686351(not included) or straight from the bottle, with a brush, dropper or spray bottle. 1oz bottle.