diff --git a/lessc.inc.php b/lessc.inc.php
index 2292f219..3131e28a 100644
--- a/lessc.inc.php
+++ b/lessc.inc.php
@@ -1199,6 +1199,36 @@ protected function lib_percentage($arg) {
 		return array("number", $num*100, "%");
 	}
 
+	// Mix color with white in variable proportion. It is the same as calling mix(#ffffff, @color, @weight)
+	// tint(@color, [@weight: 50%]);
+	// Returns: color
+	// http://lesscss.org/functions/#color-operations-tint
+	protected function lib_tint($args) {
+		$white = ['color', 255, 255, 255];
+		if ($args[0] == 'color') {
+			return $this->lib_mix([ 'list', ',', [$white, $args] ]);
+		} elseif ($args[0] == "list" && count($args[2]) == 2) {
+			return $this->lib_mix([ $args[0], $args[1], [$white, $args[2][0], $args[2][1]] ]);
+		} else {
+			$this->throwError("tint expects (color, weight)");
+		}
+	}
+
+	// Mix color with black in variable proportion. It is the same as calling mix(#000000, @color, @weight)
+	// shade(@color, [@weight: 50%]);
+	// Returns: color
+	// http://lesscss.org/functions/#color-operations-shade
+	protected function lib_shade($args) {
+		$black = ['color', 0, 0, 0];
+		if ($args[0] == 'color') {
+			return $this->lib_mix([ 'list', ',', [$black, $args] ]);
+		} elseif ($args[0] == "list" && count($args[2]) == 2) {
+			return $this->lib_mix([ $args[0], $args[1], [$black, $args[2][0], $args[2][1]] ]);
+		} else {
+			$this->throwError("tint expects (color, weight)");
+		}
+	}
+
 	// mixes two colors by weight
 	// mix(@color1, @color2, [@weight: 50%]);
 	// http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
diff --git a/tests/inputs/colors.less b/tests/inputs/colors.less
index 7fd47a3c..90d01728 100644
--- a/tests/inputs/colors.less
+++ b/tests/inputs/colors.less
@@ -37,6 +37,11 @@ body {
 	two1: fadeout(#029f23, 10%);
 	two2: fadein(#029f23, -10%);
 
+	tint1: tint(#e0e0e0);
+	tint2: tint(#e0e0e0, 40%);
+
+	shade1: shade(#e0e0e0);
+	shade2: shade(#e0e0e0, 40%);
 
 	three1: fadein(rgba(1,2,3, 0.5), 10%);
 	three2: fadeout(rgba(1,2,3, 0.5), -10%);
diff --git a/tests/outputs/colors.css b/tests/outputs/colors.css
index 5310ffb0..9a6243c6 100644
--- a/tests/outputs/colors.css
+++ b/tests/outputs/colors.css
@@ -26,6 +26,10 @@ body {
   one2: #abcdef;
   two1: rgba(2,159,35,0.9);
   two2: rgba(2,159,35,0.9);
+  tint1: #f0f0f0;
+  tint2: #ececec;
+  shade1: #707070;
+  shade2: #868686;
   three1: rgba(1,2,3,0.6);
   three2: rgba(1,2,3,0.6);
   four1: rgba(1,2,3,0);