Why do some ball marks look green?

[Game Used Bats]

I received two double dipped LVS sluggers and a rawlings this year from Andruw Jones, Derek Jeter and Conor Jackson. These bats display what appears to be a green ball mark. I know these bats are authentic b/c i got them directly from the player(s) but was wondering if anyone knew why the ball transfer appear to be green? Anyhelp would be great!

[earlywynnfan]

This thread already exists, if you search back a couple months. Some teams are now using BP balls with green ink.

Ken

[trsent]

I received two double dipped LVS sluggers and a rawlings this year from Andruw Jones, Derek Jeter and Conor Jackson. These bats display what appears to be a green ball mark. I know these bats are authentic b/c i got them directly from the player(s) but was wondering if anyone knew why the ball transfer appear to be green? Anyhelp would be great!

http://www.gameuseduniverse.com/vb_forum/showthread.php?t=3631&highlight=green+ball+marks

[Game Used Bats]

Thanks for the help guys! iI must have missed that thread!