October 25, 2022 Amy Shulke Underpainting, Color Swatch, Copic Blending, Elena, Undercover Color Swatch Copic Marker Underpaint: Blending Combinations for Realistic Color - Deep Blood Red (O Negative) October 25, 2022 Amy Shulke Underpainting, Color Swatch, Copic Blending, Elena, Undercover Color Swatch Add deathly shade to a bloody red Copic Marker blending combination by adding one BV purple marker. Get the full recipe here.