So I implemented some horizontal lines in my Chart like this: http://jsfiddle.net/mn8x6fso/27/

The Chart is inside a popup which is displayed when a Button is clicked. Normally, the storkes should be I a light grey. But with each closing and creating of the Chart, the strokes are getting a bit dark, until they are solid black.

I tried things like this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height); or to replace the canvas element with a new fresh one. Nothing helped for me.

Has someone faced the same problem or does anyone have got a solution?