diff --git a/css/index.css b/css/index.css
index 0797745..679771f 100644
--- a/css/index.css
+++ b/css/index.css
@@ -146,8 +146,25 @@ body {
 	position: absolute;
 }
 
+/* Mask colors for mask inversion */
+/* Filters are some magic acquired at https://codepen.io/sosuke/pen/Pjoqqp */
 .maskPaintCanvas {
-	filter: opacity(40%);
+	opacity: 0%;
+}
+
+.maskPaintCanvas.display {
+	opacity: 40%;
+	filter: invert(100%);
+}
+
+.maskPaintCanvas.display.clear {
+	filter: invert(71%) sepia(46%) saturate(6615%) hue-rotate(321deg)
+		brightness(106%) contrast(100%);
+}
+
+.maskPaintCanvas.display.hold {
+	filter: invert(41%) sepia(16%) saturate(5181%) hue-rotate(218deg)
+		brightness(103%) contrast(108%);
 }
 
 .strokeText {
diff --git a/js/ui/tool/dream.js b/js/ui/tool/dream.js
index 97875b2..8c40d88 100644
--- a/js/ui/tool/dream.js
+++ b/js/ui/tool/dream.js
@@ -253,12 +253,18 @@ const dreamTool = () =>
 			mouse.listen.canvas.onmousemove.on(state.mousemovecb);
 			mouse.listen.canvas.left.onclick.on(state.dreamcb);
 			mouse.listen.canvas.right.onclick.on(state.erasecb);
+
+			// Display Mask
+			setMask(state.invertMask ? "hold" : "clear");
 		},
 		(state, opt) => {
 			// Clear Listeners
 			mouse.listen.canvas.onmousemove.clear(state.mousemovecb);
 			mouse.listen.canvas.left.onclick.clear(state.dreamcb);
 			mouse.listen.canvas.right.onclick.clear(state.erasecb);
+
+			// Hide Mask
+			setMask("none");
 		},
 		{
 			init: (state) => {
@@ -286,7 +292,10 @@ const dreamTool = () =>
 					state.ctxmenu.invertMaskLabel = _toolbar_input.checkbox(
 						state,
 						"invertMask",
-						"Invert Mask"
+						"Invert Mask",
+						() => {
+							setMask(state.invertMask ? "hold" : "clear");
+						}
 					).label;
 
 					// Overmasking Slider
@@ -326,12 +335,18 @@ const img2imgTool = () =>
 			mouse.listen.canvas.onmousemove.on(state.mousemovecb);
 			mouse.listen.canvas.left.onclick.on(state.dreamcb);
 			mouse.listen.canvas.right.onclick.on(state.erasecb);
+
+			// Display Mask
+			setMask(state.invertMask ? "hold" : "clear");
 		},
 		(state, opt) => {
 			// Clear Listeners
 			mouse.listen.canvas.onmousemove.clear(state.mousemovecb);
 			mouse.listen.canvas.left.onclick.clear(state.dreamcb);
 			mouse.listen.canvas.right.onclick.clear(state.erasecb);
+
+			// Hide mask
+			setMask("none");
 		},
 		{
 			init: (state) => {
@@ -361,7 +376,7 @@ const img2imgTool = () =>
 						const auxCtx = auxCanvas.getContext("2d");
 
 						if (state.keepBorderSize > 0) {
-							auxCtx.fillStyle = "#6A6AFF50";
+							auxCtx.fillStyle = "#6A6AFF7F";
 							auxCtx.fillRect(0, 0, state.keepBorderSize, bb.h);
 							auxCtx.fillRect(0, 0, bb.w, state.keepBorderSize);
 							auxCtx.fillRect(
@@ -403,7 +418,10 @@ const img2imgTool = () =>
 					state.ctxmenu.invertMaskLabel = _toolbar_input.checkbox(
 						state,
 						"invertMask",
-						"Invert Mask"
+						"Invert Mask",
+						() => {
+							setMask(state.invertMask ? "hold" : "clear");
+						}
 					).label;
 
 					// Inpaint Full Resolution Checkbox
diff --git a/js/ui/tool/maskbrush.js b/js/ui/tool/maskbrush.js
index ca84d47..169f502 100644
--- a/js/ui/tool/maskbrush.js
+++ b/js/ui/tool/maskbrush.js
@@ -1,10 +1,34 @@
+const setMask = (state) => {
+	const canvas = document.querySelector("#maskPaintCanvas");
+	switch (state) {
+		case "clear":
+			canvas.classList.remove("hold");
+			canvas.classList.add("display", "clear");
+			break;
+		case "hold":
+			canvas.classList.remove("clear");
+			canvas.classList.add("display", "hold");
+			break;
+		case "neutral":
+			canvas.classList.remove("clear", "hold");
+			canvas.classList.add("display");
+			break;
+		case "none":
+			canvas.classList.remove("display", "hold", "clear");
+			break;
+		default:
+			console.debug(`Invalid mask type: ${state}`);
+			break;
+	}
+};
+
 const _mask_brush_draw_callback = (evn, state) => {
 	if (
 		(evn.initialTarget && evn.initialTarget.id === "overlayCanvas") ||
 		(!evn.initialTarget && evn.target.id === "overlayCanvas")
 	) {
 		maskPaintCtx.globalCompositeOperation = "source-over";
-		maskPaintCtx.strokeStyle = "#FF6A6A";
+		maskPaintCtx.strokeStyle = "black";
 
 		maskPaintCtx.lineWidth = state.brushSize;
 		maskPaintCtx.beginPath();
@@ -24,7 +48,7 @@ const _mask_brush_erase_callback = (evn, state) => {
 		(!evn.initialTarget && evn.target.id === "overlayCanvas")
 	) {
 		maskPaintCtx.globalCompositeOperation = "destination-out";
-		maskPaintCtx.strokeStyle = "#FFFFFFFF";
+		maskPaintCtx.strokeStyle = "black";
 
 		maskPaintCtx.lineWidth = state.brushSize;
 		maskPaintCtx.beginPath();
@@ -54,6 +78,9 @@ const maskBrushTool = () =>
 			mouse.listen.canvas.left.onpaint.on(state.drawcb);
 			mouse.listen.canvas.right.onpaintstart.on(state.erasecb);
 			mouse.listen.canvas.right.onpaint.on(state.erasecb);
+
+			// Display Mask
+			setMask("neutral");
 		},
 		(state, opt) => {
 			// Clear Listeners
@@ -63,6 +90,9 @@ const maskBrushTool = () =>
 			mouse.listen.canvas.left.onpaint.clear(state.drawcb);
 			mouse.listen.canvas.right.onpaintstart.clear(state.erasecb);
 			mouse.listen.canvas.right.onpaint.clear(state.erasecb);
+
+			// Hide Mask
+			setMask("none");
 		},
 		{
 			init: (state) => {
@@ -81,10 +111,10 @@ const maskBrushTool = () =>
 
 				state.movecb = (evn) => {
 					if (evn.target.id === "overlayCanvas") {
-						// draw big translucent red blob cursor
+						// draw big translucent white blob cursor
 						ovCtx.beginPath();
 						ovCtx.arc(evn.x, evn.y, state.brushSize / 2, 0, 2 * Math.PI, true); // for some reason 4x on an arc is === to 8x on a line???
-						ovCtx.fillStyle = "#FF6A6A50";
+						ovCtx.fillStyle = "#FFFFFF50";
 						ovCtx.fill();
 					}
 				};
diff --git a/js/ui/toolbar.js b/js/ui/toolbar.js
index eb56ac9..955f6df 100644
--- a/js/ui/toolbar.js
+++ b/js/ui/toolbar.js
@@ -132,13 +132,16 @@ const toolbar = {
  * Premade inputs for populating the context menus
  */
 const _toolbar_input = {
-	checkbox: (state, dataKey, text) => {
+	checkbox: (state, dataKey, text, cb = null) => {
 		if (state[dataKey] === undefined) state[dataKey] = false;
 
 		const checkbox = document.createElement("input");
 		checkbox.type = "checkbox";
 		checkbox.checked = state[dataKey];
-		checkbox.onchange = () => (state[dataKey] = checkbox.checked);
+		checkbox.onchange = () => {
+			state[dataKey] = checkbox.checked;
+			cb && cb();
+		};
 
 		const label = document.createElement("label");
 		label.appendChild(checkbox);
diff --git a/js/util.js b/js/util.js
index f99d46f..0069c7a 100644
--- a/js/util.js
+++ b/js/util.js
@@ -35,7 +35,7 @@ const guid = (size = 3) => {
 			.toString(16)
 			.substring(1);
 	};
-	// returns id of format 'aaaaaaaa'-'aaaa'-'aaaa'-'aaaa'-'aaaaaaaaaaaa'
+	// returns id of format 'aaaa'-'aaaa'-'aaaa' by default
 	let id = "";
 	for (var i = 0; i < size - 1; i++) id += s4() + "-";
 	id += s4();