Mr. Duff spends many hours finding and buying glass bottles. Notice his large collection of antique tools that were used to make them. He also shared the secret of the unusual clear green color of the Pitkin glass bottles. Can you guess what this might be? Hint: it was purchased and brought in from a river bed in New Jersey. Mr. Duff also shared how we could tell the age of a bottle, how it was made, and if it is an original or a fake.