diff --git a/src/azure_hl.rs b/src/azure_hl.rs
index 101b647..4939356 100644
--- a/src/azure_hl.rs
+++ b/src/azure_hl.rs
@@ -108,6 +108,7 @@ impl Color {
     }
 }
 
+pub static TRANSPARENT: Color = Color { r: 0., g: 0., b: 0., a: 0.};
 
 // FIXME: Should have a class hierarchy here starting with Pattern.
 pub struct ColorPattern {