diff --git a/ui (gen4)/css/experimenting.css b/ui (gen4)/css/experimenting.css
index 09e20222..a559f203 100755
--- a/ui (gen4)/css/experimenting.css	
+++ b/ui (gen4)/css/experimenting.css	
@@ -137,7 +137,8 @@ body {
 /*********************************************************************/
 
 .image-bw {
-	filter: saturate(0);
+	/*filter: saturate(0);*/
+	filter: grayscale(1);
 }
 .image-show-shadows {
 	filter: contrast(0.8) brightness(3) contrast(1.5);
diff --git a/ui (gen4)/features/ui.js b/ui (gen4)/features/ui.js
index 6b11c87e..ac24195a 100755
--- a/ui (gen4)/features/ui.js	
+++ b/ui (gen4)/features/ui.js	
@@ -2519,7 +2519,6 @@ module.FailsafeDevTools = core.ImageGridFeatures.Feature({
 
 
 /*********************************************************************/
-// XXX experimental...
 
 var PreviewFilters
 module.PreviewFilters = core.ImageGridFeatures.Feature({
@@ -2600,6 +2599,11 @@ module.PreviewFilters = core.ImageGridFeatures.Feature({
 	],
 })
 
+
+
+/*********************************************************************/
+// XXX experimental...
+
 // 		...not sure if this is the right way to go...
 // XXX need to get the minimal size and not the width as results will 
 // 		depend on viewer format...