diff --git a/include/libzutil.h b/include/libzutil.h
index f63a1fa8c8..36f8474e15 100644
--- a/include/libzutil.h
+++ b/include/libzutil.h
@@ -150,10 +150,16 @@ int zfs_ioctl_fd(int fd, unsigned long request, struct zfs_cmd *zc);
 /*
  * List of colors to use
  */
+#define	ANSI_BLACK	"\033[0;30m"
 #define	ANSI_RED	"\033[0;31m"
 #define	ANSI_GREEN	"\033[0;32m"
 #define	ANSI_YELLOW	"\033[0;33m"
 #define	ANSI_BLUE	"\033[0;34m"
+#define	ANSI_BOLD_BLUE	"\033[1;34m" /* light blue */
+#define	ANSI_MAGENTA	"\033[0;35m"
+#define	ANSI_CYAN	"\033[0;36m"
+#define	ANSI_GRAY	"\033[0;37m"
+
 #define	ANSI_RESET	"\033[0m"
 #define	ANSI_BOLD	"\033[1m"
 
diff --git a/lib/libzfs/libzfs_diff.c b/lib/libzfs/libzfs_diff.c
index b9698bb22b..cf625949fe 100644
--- a/lib/libzfs/libzfs_diff.c
+++ b/lib/libzfs/libzfs_diff.c
@@ -56,10 +56,10 @@
 #define	ZDIFF_REMOVED	'-'
 #define	ZDIFF_RENAMED	"R"
 
-#define	ZDIFF_ADDED_COLOR ANSI_GREEN
+#define	ZDIFF_ADDED_COLOR    ANSI_GREEN
 #define	ZDIFF_MODIFIED_COLOR ANSI_YELLOW
-#define	ZDIFF_REMOVED_COLOR ANSI_RED
-#define	ZDIFF_RENAMED_COLOR ANSI_BLUE
+#define	ZDIFF_REMOVED_COLOR  ANSI_RED
+#define	ZDIFF_RENAMED_COLOR  ANSI_BOLD_BLUE
 
 /*
  * Given a {dsname, object id}, get the object path
diff --git a/lib/libzfs/libzfs_util.c b/lib/libzfs/libzfs_util.c
index 8eb7582ba0..8aee9d30cd 100644
--- a/lib/libzfs/libzfs_util.c
+++ b/lib/libzfs/libzfs_util.c
@@ -2073,10 +2073,11 @@ use_color(void)
 }
 
 /*
- * color_start() and color_end() are used for when you want to colorize a block
- * of text.  For example:
+ * The functions color_start() and color_end() are used for when you want
+ * to colorize a block of text.
  *
- * color_start(ANSI_RED_FG)
+ * For example:
+ * color_start(ANSI_RED)
  * printf("hello");
  * printf("world");
  * color_end();
@@ -2084,7 +2085,7 @@ use_color(void)
 void
 color_start(const char *color)
 {
-	if (use_color()) {
+	if (color && use_color()) {
 		fputs(color, stdout);
 		fflush(stdout);
 	}
@@ -2099,7 +2100,9 @@ color_end(void)
 	}
 }
 
-/* printf() with a color.  If color is NULL, then do a normal printf. */
+/*
+ * printf() with a color. If color is NULL, then do a normal printf.
+ */
 int
 printf_color(const char *color, char *format, ...)
 {