London Strives For Zero Waste Summer Olympics 2012
The color-coding was also utilized on the packaging and service ware — as shown above in the top symbol on the McDonald’s cups and container — to match with the proper receptacle, in this case, orange for composting.

Compostable packaging and existing process infrastructure help UK make good on its promise to leave a sustainable legacy.
Dan Sullivan
BioCycle September 2012, Vol. 53, No. 9, p. 32