anchor.diff:            mainAxisAlignment: MainAxisAlignment.spaceBetween,
             children: <Widget>[
               new Text(key, style: style),
  -            new Text('0x${textColor.value.toRadixString(16).toUpperCase()}',
  -                style: style),
  +            new Text('0x${textColor.value.toRadixString(16).toUpperCase()}', style: style),
             ],
           ),
         ));
       }
  -    return buildSwatch(
  -        context,
  -        new Material(
  -          color: Colors.white,
  -          child: new Center(
  -            child: new Container(
  -              key: key,
  -              width: 300.0,
  -              color: background,
  -              child: new Column(
  -                mainAxisSize: MainAxisSize.min,
  -                children: items,
  -              ),
  -            ),
  -          ),
  -        ));
  -  }
  -}
  -
  -class HomePage extends StatelessWidget {
  -  final List<Page> pages;
  -
  -  HomePage(this.pages);
  -
  -  @override
  -  Widget build(BuildContext context) {
  -    return new GestureDetector(
  -      onTap: () async {
  -        for (var page in pages.reversed) {
  -          Navigator.of(context).pushNamed('/' + page.filename);
  -        }
  -      },
  -      child: new Material(
  -        color: Colors.white,
  -        child: new Center(
  -            child: new Text("Tap to advance to the color swatches.")),
  +    return new Container(
  +      key: key,
  +      width: 300.0,
  +      color: background,
  +      child: new Column(
  +        mainAxisSize: MainAxisSize.min,
  +        children: items,
         ),
       );
     }
   }
   
   Future<Null> main() async {
  -  const List<int> palette = const <int>[
  -    50,
  -    100,
  -    200,
  -    300,
  -    400,
  -    500,
  -    600,
  -    700,
  -    800,
  -    900
  -  ];
  -  const List<int> accentPalette = const <int>[100, 200, 400, 700];
  -  const List<int> greyPalette = const <int>[
  -    50,
  -    100,
  -    200,
  -    300,
  -    350,
  -    400,
  -    500,
  -    600,
  -    700,
  -    800,
  -    850,
  -    900
  -  ];
  +  const List<int> palette = const <int>[ 50, 100, 200, 300, 400, 500, 600, 700, 800, 900 ];
  +  const List<int> accentPalette = const <int>[ 100, 200, 400, 700 ];
  +  const List<int> greyPalette = const <int>[ 50, 100, 200, 300, 350, 400, 500, 600, 700, 800, 850, 900 ];
     final List<Page> pages = <Page>[
       const SwatchPage('Colors.red', Colors.red, palette),
       const SwatchPage('Colors.pink', Colors.pink, palette),
  
positive.code:       'white70': Colors.white70,
      }),
    ];
    print('This app will display a sequence of images. For each one, tap "s"');
    print('in the console to take a screenshot, then tap the screen to');
    print('advance. When all is done, a script will be dumped that shows the');
    print('commands to run to convert all the screenshots to images.');
    print('BASH: N=1 # set this to the number of the first screenshot file');
    Map<String, WidgetBuilder> routes = <String, WidgetBuilder>{};
    for (Page page in pages) {
      routes['/' + page.filename] = page.build;
      print('COLOR: ${page.filename}');
    }
    runApp(new MaterialApp(onGenerateRoute: (RouteSettings settings) {
      if (settings.isInitialRoute &&
          settings.name == Navigator.defaultRouteName) {
        return new MaterialPageRoute<Null>(
          builder: (BuildContext context) {
            return new HomePage(pages);
          },
          settings: settings,
        );
      } else {
        return new MaterialPageRoute<Null>(
          builder: routes[settings.name],
          settings: settings,
        );
      }
    }));
  }
  
negative.code:   Widget build(BuildContext context) {
      List<Widget> items = <Widget>[];
      for (int key in keys) {
        Color textColor = ThemeData.estimateBrightnessForColor(swatch[key]) == Brightness.light ? Colors.black : Colors.white;
        TextStyle style = new TextStyle(color: textColor);
        String label;
        if (swatch[key].value == swatch.value) {
  