Thanks YungChun for the comments! In Japan all plastics/pet, indeed pretty much everything, is labeled already. For example if you buy a yogurt the lid and the paper wrapper and the underlying plastic tub are all labeled. These labels are all in Japanese though, so a multilingual reader app will be helpful. In many countries (USA for example) there is detailed labeling but it many people don't understand the symbols or what to do with the items. We will build up by use a database of many countries' labeling schemes, and also, eventually attempt a 'shazam for plastic' interface which will attempt to recognize things simply from photographing them from the app (this will be less reliable than labeling of course).