I am still looking for a screen accurate scar solution as well.
Since I never heard back from his hair stylist, I am just going to tell you guys what she said. The style his hair she used Redken Disrupt
http://www.redken.com/products/mens/styling/disrupt
That stuff really works! I found some locally about a week ago and in a matter of minutes you can get the right look.
But unfortunately the green is no longer being made. It was called "Jeans Green" by Alfaparf. Been out of production for quite some time, and the shelf life on this stuff is about a year so no luck finding new old stock or anything. Believe me I have tried. I even emailed the manufacturer and they have no plans for a re-release. This should be the next best thing
http://www.extendedlengths.com/pamiingr42oz.html