Floran's Ecoglas is produced from 100% recycled glass and is therefore very sustainable. The glass that everyone brings to the bottle bank is used in this process. Because there is always a little bit of pollution in recycled glass, you can see more irregularities, which makes each item unique. Also, this glass is not entirely clear and seems to have a blue-green glow. Isn't it great how this process works? No waste and beautiful, usable products. That makes the feeling with these items even better!