Grafica de Pie [Multiple Datasets] con Chart.js

pie2-chart.js

var ctx = document.getElementById("chart1");
var red = "#f00";
var orange = "#f50";
var yellow = "#ff0";
var green = "#0f0";
var blue = "#00f";
var myPieChart = new Chart(ctx,{
type: 'pie',
        data: {
            datasets: [{
                data: [ 1,2,3,4,5 ],
                backgroundColor: [ red, orange, yellow,green, blue],
                label: 'Dataset 1'
            },
            {
                data: [ 2,6,9,3,1 ],
                backgroundColor: [ red, orange, yellow,green, blue],
                label: 'Dataset 2'
            }

            ],
            labels: [ "Red", "Orange", "Yellow", "Green", "Blue" ]
        },
        options: {
            responsive: true
        }
});