diff --git a/src/main/java/cit/PureATN/MultiNote/KeyEvent_on_MultiNote.java b/src/main/java/cit/PureATN/MultiNote/KeyEvent_on_MultiNote.java
index 3e60da1..75f6254 100644
--- a/src/main/java/cit/PureATN/MultiNote/KeyEvent_on_MultiNote.java
+++ b/src/main/java/cit/PureATN/MultiNote/KeyEvent_on_MultiNote.java
@@ -46,6 +46,10 @@
             MultiNote mn = (MultiNote)Note.theapp;
             mn.showStat();            
         }
+        if (e.getKeyCode() == KeyEvent.VK_DELETE) {
+            MultiNote mn = (MultiNote)Note.theapp;
+            mn.deleteAllStrokes();            
+        }
 
         if (e.getKeyCode() == KeyEvent.VK_Z) {
             // System.out.println("SimpleATN zoomLevel = "+getZoomLevel());
diff --git a/src/main/java/cit/PureATN/MultiNote/MultiNote.java b/src/main/java/cit/PureATN/MultiNote/MultiNote.java
index 39dc1c6..50728ae 100644
--- a/src/main/java/cit/PureATN/MultiNote/MultiNote.java
+++ b/src/main/java/cit/PureATN/MultiNote/MultiNote.java
@@ -28,7 +28,7 @@
 
 public class MultiNote extends Note {
     static int width = 920;
-    static int height = (int)(width*1.42);
+    static int height = (int) (width * 1.42);
 
     public MultiNote() {
         this(null);
@@ -57,7 +57,7 @@
         // 追加機能：右クリックでメニューをだす
         getCanvas().getCamera().addInputEventListener(new MouseEvent_onMN(this));
 
-        currentTitle = "MultiNote  (Esc key to zoom whole strokes)";
+        currentTitle = "MultiNote  ([c]色付け [DEL]全削除 [Esc]ズーム)";
         // setTitle(currentTitle);
         setMousePenID(1);
 
@@ -76,6 +76,8 @@
             getCanvas().getLayer().addChild(stjk);
         }
         // getCanvas().getLayer().addChild(PPath.createRectangle(100, 100, 700, 990));
+        requestFocus();
+
     }
 
     public SquiggleEventHandler createSquiggleEvent() { // may be overridden
@@ -95,11 +97,11 @@
             int penid = Integer.parseInt(penid0x);
             // System.out.println(penid+" "+penid*penid); //pen06
 
-            Color c = Color.getHSBColor((float) (penid / 10.0f), 0.8f, 0.8f);
+            Color c = Color.getHSBColor((float) (penid / 10.0f), 1.0f, 1.0f);
             ArrayList<ShortStroke> sss = PenUser.find(penidStr).strokes;
             for (ShortStroke s : sss) {
                 s.setStrokePaint(c);
-                System.out.println("ss.time " + s.time);
+                // System.out.println("ss.time " + s.time);
                 if (s.getParent() instanceof PLayer) {
                     shitajikiNodes[penid].addChild(s); // 親レイヤーから、下敷きに移動
                 }
@@ -109,7 +111,7 @@
     }
 
     // stroke.addAttribute("moveTarget", stroke);
-    public void setMoveTargetToShortStroke(boolean isenable){
+    public void setMoveTargetToShortStroke(boolean isenable) {
         Enumeration<String> ite = PenUser.penusers.keys();
         while (ite.hasMoreElements()) {
             String penidStr = ite.nextElement();
@@ -120,7 +122,7 @@
             Color c = Color.getHSBColor((float) (penid / 10.0f), 0.8f, 0.8f);
             ArrayList<ShortStroke> sss = PenUser.find(penidStr).strokes;
             for (ShortStroke s : sss) {
-                if (isenable){
+                if (isenable) {
                     s.addAttribute("moveTarget", s);
                 } else {
                     s.addAttribute("moveTarget", null);
@@ -130,7 +132,6 @@
 
     }
 
-
     /**
      * 筆記数の確認サンプル：PenIDごとに、筆記数を表示する
      */
@@ -232,7 +233,24 @@
         // if (matchCount==1 && lastMatchID > 0){
         if (lastMatchID > 0) {
             setMousePenID(lastMatchID);
-            System.out.println("switch to " + lastMatchID+ "(count = "+matchCount+")");
+            System.out.println("switch to " + lastMatchID + "(count = " + matchCount + ")");
+        }
+    }
+
+    // すべての筆記を消す
+    public void deleteAllStrokes() {
+
+        for (int i = 1; i < 11; i++) {
+            PPath stjk = shitajikiNodes[i];
+            stjk.removeAllChildren();
+        //     var children = stjk.getChildrenReference();
+        //     for (var child : children) {
+        //         if (child instanceof PPath) {
+        //             PPath pchild = (PPath) child;
+        //             pchild.removeFromParent();
+        //         }
+        //     }
+        // }
         }
     }
 }
diff --git a/src/main/java/cit/PureATN/MultiNote/PopupMenu_forMN.java b/src/main/java/cit/PureATN/MultiNote/PopupMenu_forMN.java
index b14ca16..858864d 100644
--- a/src/main/java/cit/PureATN/MultiNote/PopupMenu_forMN.java
+++ b/src/main/java/cit/PureATN/MultiNote/PopupMenu_forMN.java
@@ -48,6 +48,7 @@
 
 		// あたらしいメニューアイテムの設定を開始する。
 		menuItem = new JMenuItem("色付け");
+		menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, 0));// メニュー表示時のショートカットキー
 		menuItem.addActionListener(new ActionListener() {
 			public void actionPerformed(ActionEvent e) {
 
@@ -56,6 +57,19 @@
 		});
 		add(menuItem);// add 色付け menu
 
+		// あたらしいメニューアイテムの設定を開始する。
+		menuItem = new JMenuItem("全筆記削除");
+		menuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0));// メニュー表示時のショートカットキー
+		menuItem.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent e) {
+
+				fframe.deleteAllStrokes();
+			}
+		});
+		add(menuItem);// add 色付け menu
+
+
+
 		// 追加のメニューは，プラグインが直接オンデマンドで追加する
 		// fframe.addPluginMenuTo(this);
 		addPluginMenuTo(this, aFR);
diff --git a/src/main/java/cit/PureATN/ShortStroke.java b/src/main/java/cit/PureATN/ShortStroke.java
index 1d314cd..2112939 100644
--- a/src/main/java/cit/PureATN/ShortStroke.java
+++ b/src/main/java/cit/PureATN/ShortStroke.java
@@ -132,11 +132,13 @@
 		this.moveTo(px,py);
 	}
 	public void drag_on_draw(double px, double py){
+		if (tempPts == null) return;
 		tempPts.add(new Point2D.Double(px,py));
 		this.lineTo(px,py);
 	}
 	public void endDrag_on_draw(){
 		// 下敷きが用意されていれば、Layerから下敷きに移動する
+		if (tempPts == null) return;
 		applyTempPtsToAry();
 		if (Note.theapp instanceof MultiNote){
 			//下敷きを特定