diff --git a/less/_01-base.less b/less/_01-base.less
index 804ac7e..ab9a8ee 100644
--- a/less/_01-base.less
+++ b/less/_01-base.less
@@ -65,7 +65,7 @@ html {
 	
 	/* IE9-IE11 math fixing. See http://bit.ly/1g4X0bX */
 	/* thanks to @guardian, @victorbritopro and @eQRoeil */
-	font-size: calc(1em * 0.625);
+	font-size: ~'calc(1em * .625)';
 	
 	/* disallow text zooming on orientation change (non standard property) */
 	-webkit-text-size-adjust: 100%;
diff --git a/less/_08-print.less b/less/_08-print.less
index 0e7012f..1612649 100644
--- a/less/_08-print.less
+++ b/less/_08-print.less
@@ -45,10 +45,6 @@
 		display: none;
 	}
 	
-	img {
-		filter: grayscale(100%);
-	}
-	
 	/* no orphans, no widows */
 	p,
 	.p-like,
diff --git a/sass/_08-print.scss b/sass/_08-print.scss
index 4827f45..3f7edf1 100644
--- a/sass/_08-print.scss
+++ b/sass/_08-print.scss
@@ -44,10 +44,6 @@
 		display: none;
 	}
 	
-	img {
-		filter: grayscale(100%);
-	}
-	
 	/* no orphans, no widows */
 	p,
 	.p-like,