Feature Request: Erase Single Color or Specific Graph

[briankb]

This is great! I'm sure my friends and I will waste countless hours with this page and even more when it makes it to iOS!

It would be great if you could add a few more erase functions. First and probably the easiest would be to simple erase a specific color, whatever color is selected. And second if you could erase a specific graph, even one that may already be under or between other graphs. I have used the Undo feature but I created a neat looking spirograph except for the very first which was a giant one in Orange. In this case it was the only Orange graph so the option to erase a specific color would have worked and allowed me to save and share the rest.