Red i used on my Slaves to darkness cloaks. 
  - Step 1:  Zenithal uncercoat from black to white-ish grey. 
 - Step 2: Thin layer of   Khorne Red  the another layer of   Khorne Red  but now leaving out the deepest shadows.
 - Step 3: Light Drybrush of   Wazdakka Red   with a makeup brush.
 - Sept 4: Layer thinned   Wazdakka Red   on the raised areas and blend in the shadows.
 - Step 5: Highlight raised areas with   Evil Sunz Scarlet  
 - Step 6: Highlight end of edges and cracks with   Khador Red Highlight  
 - Step 7: Increase the shadows with   Naggaroth Night   or   Coal Black  or even   Druchii Violet