How can I tell the difference between compostable bioplastics and petroleum-based plastics?
Recycling symbols #1-6 are reserved for plastic products. Bio-plastics and all other plasticized products, fall under the #7 symbol as "Other" although they are not always labeled as such. Sometimes they can be labeled as "0".
Look for the word “compostable” or a certification logo like the green swirl design from the Biodegradable Products Institute.