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diff --git a/colour.c b/colour.c
new file mode 100644
index 0000000..e0936b9
--- /dev/null
+++ b/colour.c
@@ -0,0 +1,55 @@
+
+// colour.c
+
+// includes
+
+#include "colour.h"
+#include "util.h"
+
+// functions
+
+// colour_is_ok()
+
+bool colour_is_ok(int colour) {
+
+   return colour == Black || colour == White;
+}
+
+// colour_is_white()
+
+bool colour_is_white(int colour) {
+
+   ASSERT(colour_is_ok(colour));
+
+   return colour == White;
+}
+
+// colour_is_black()
+
+bool colour_is_black(int colour) {
+
+   ASSERT(colour_is_ok(colour));
+
+   return colour == Black;
+}
+
+// colour_equal()
+
+bool colour_equal(int colour_1, int colour_2) {
+
+   ASSERT(colour_is_ok(colour_2));
+
+   return (colour_1 & colour_2) != 0;
+}
+
+// colour_opp()
+
+int colour_opp(int colour) {
+
+   ASSERT(colour_is_ok(colour));
+
+   return colour ^ (BlackFlag^WhiteFlag);
+}
+
+// end of colour.cpp
+