diff --git a/app/main.go b/app/main.go
index d7278b6..a025dca 100644
--- a/app/main.go
+++ b/app/main.go
@@ -81,7 +81,14 @@ func main() {
 	fmt.Printf("C1: %s \n",c1.EscapeValues())
 	fmt.Println(c1)
 
-	c1 = c1.SetStyle(ansi.StyleBlink)
+	c1 = c1.SetStyle(ansi.StyleBlink).SetBgColor(ansi.ColorHWhite)
 	fmt.Printf("C1: %s \n",c1.EscapeValues())
+	fmt.Print(c1.Esc())
 	fmt.Println(c1)
+
+	c1 = c1.DelStyle(ansi.StyleBold)
+	fmt.Printf("C1: %s \n",c1.EscapeValues())
+	fmt.Print(c1.Esc())
+	fmt.Println(c1)
+
 }
diff --git a/core/ansi/code.go b/core/ansi/code.go
index 257515a..0ee6ea9 100644
--- a/core/ansi/code.go
+++ b/core/ansi/code.go
@@ -44,6 +44,7 @@ const (
 	txMask  Code = 0b1111110000000000
 	bgShift int = 5
 	stShift int = 10
+	stOpts  int = 3
 )
 
 
@@ -119,15 +120,22 @@ func (c Code) SetColors(fg, bg Color) Code {
 
 
 func (c Code) SetStyle (sty Style) Code {
-	 v := Code(sty)
-	 s := c >> 10
-	 if s != 0 {
-		 v = (((s >> 3) & ^ v) << 3) | v
-	 }
-
+	/*
+	v := Code(sty)
+	v = ((((c >> 10) >> stOpts) & ^ v) << stOpts) | v
 	return v << 10 | (c & clMask)
+
+	 */
+	v := Code(sty) << stShift
+	return ((((c & txMask) >> stOpts) &^ v) << stOpts | v) | c & clMask
 }
 
+func (c Code) DelStyle (sty Style) Code {
+	v := Code(sty) << (stOpts + stShift)
+	return ((((c & txMask) << stOpts) &^ v) >> stOpts | v) | c & clMask
+}
+
+
 
 func (c Code) IsBoldOn () bool {
 	return c & TextBoldOn != 0 }
diff --git a/core/ansi/style.go b/core/ansi/style.go
index ad019ff..403e675 100644
--- a/core/ansi/style.go
+++ b/core/ansi/style.go
@@ -30,11 +30,9 @@ const (
 	StyleUnderline
 	StyleBlink
 
-	//StyleNonBold
-	//StyleNonUnderline
-	//StyleNonBlink
-
 	StyleNone Style = 0
+
+	allStyles  = StyleBold | StyleUnderline | StyleBlink
 )
 
 type (
@@ -45,6 +43,6 @@ type (
 
 
 func (s Style) IsValid () bool {
-	return true
+	return s <= allStyles
 }