We buy 1% milk in plastic half-gallon (pottle 🙂 jugs. When we finish one, we rinse it and put the jug out with the recyclables. Occasionally there is a time lag between the rinsing and the recycling.
When that occurs, I turn the jug over to drain out any residual rinse water. For reasons I don't quite understand, this water is invariably yellow-green. Sometimes very green. It's difficult to believe that algae is growing in this few drops of water but… why is it green?
vlbrown-mzydt 