White, emerald green and brown are the most common colors. They came from jars, plain bottles and beer bottles thrown into the water. Olive green, cobalt blue, aqua and amber are harder to find. They came from medicine bottles, soda bottles and cosmetic jars. The rarest colors are red, orange and yellow. They were originally items such as fine china, streetlamps and even ship lanterns. Many colors are unique to certain periods of history. Small bubbles in the glass help to identify the original glass item.