Alexandra took us at high tide to a beach near her apartment that was covered with glass. Few of the pieces had much burnish from time in the water -- but it was HIGH tide. The pieces that we could see were rarely covered by the water.
We found TWO pieces of true yellow, including the one depicted here (I gave the other to James, who loves yellow). I have never found such true yellow glass anywhere. I would really love to go back at LOW tide!