The basics A slightly opaque blood with the consistency of jelly for use when very slow moving blood is desired for more manageable continuity. The benefits Cleans up well with shaving cream or Ivory soap. The Look Bright - To suggest arterial bleeding or oxygen enriched blood, also for use on dark colored surfaces, or in low-light situations. Dark - To suggest vascular bleeding or oxygen depleted blood. Also for use on light colored surfaces. Extra Dark - Same color as our Drying Blood except that it does not dry. The Pro Tip For manageable continuity apply with dental spatula or cotton swabs to simulate bleeding.