December 5, 2023 Amy Shulke Underpainting, Blending Combination Copic Marker Underpaint: Blending Combinations for Realistic Color - Gray Swatch (Marshmallow on Top) December 5, 2023 Amy Shulke Underpainting, Blending Combination Today’s Copic Marker underpainting swatch combines a light YR under gray markers for sweet shade. Get the full blending combination recipe here.