The introduction of the Macchiato comes approximately one year after the launch of Dunkin' Donuts' Rainforest Alliance Certified ™ Dark Roast Coffee, one of the boldest additions ever to the brand's coffee lineup. Made with 30% Rainforest Alliance Certified ™ beans, Dunkin' Donuts' Dark Roast Coffee uses a unique roasting process to create a bold flavor and smooth finish without the bitterness typically associated with most dark roast coffees. For National Coffee Day on Tuesday, September 29, Dunkin' Donuts is celebrating the 1-year anniversary of Dark Roast with a special free offer: guests can walk into any participating Dunkin' Donuts restaurant across the country and receive a free medium cup of Dunkin' Donuts hot or iced Dark Roast Coffee, with a limit of one per guest.