-#define SKETCH_ENTITY_COLOR "#ff0000"
-#define SKETCH_EXTERNAL_COLOR "#00ff00"
-#define SKETCH_AUXILIARY_COLOR "#000000"
+#define SKETCH_ENTITY_COLOR "225,0,0"
+#define SKETCH_EXTERNAL_COLOR "170,0,225"
+#define SKETCH_AUXILIARY_COLOR "0,85,0"
+#define SKETCH_OVERCONSTRAINT_COLOR "0,0,0"