Sea glass colors are as varied as the containers from which they originated
Some are more common and more frequently found, while others are more rare, and for some, more desirable. Colors of sea glass come in varying shades of greens, reds, blues, browns, purples, and clear. They can be shiny (meaning they have only recently been broken), frosted and dull in appearance (my favorite), or frosted and dirty looking. I find the later when I am searching for sea glass on rocky shores. The dirt does not seem to wash off as it is ingrained in the glass from wear and tear it has endured along its' journey to the shore line.
Knowledge of how common or rare colors of sea glass are gives good clues as to a piece's origin and it's age, and even it's monetary value. Yes, serious collectors will pay good money for pieces of sea glass whose origins may be linked to old pirates treasures, ship wrecks, ancient containers, medicine bottles, and more
Many people believe ancient treasures have all been found and there is nothing left for the new treasure seekers, but tides and seas are constantly on the move, the earth shifts, and even made-made disruptions can lead to still new discoveries
Besides, isn't half the fun in the adventure of the seeking?
The frosted white or clear sea glass color is by far the most common and easiest to find on your beaching combing excursions. These pieces originated from clear bottles or panes of glass tossed in to the waters during a storm or even from careless littering. Sometimes however their story becomes more clear (so to speak) if it is thick, or has an edge or still visible markings.
To the artist these are perfect filler pieces
On most of my beach excursions I find enough white sea glass pieces to fill tiny bottles. These are a fun and inexpensive purchase for tourists to your area (if you are perhaps selling at a Farmer Market or craft fair).
Clean, frosted, white sea glass is found on beaches with sand
I find that brown is the next most frequent and easy to find of all sea glass colors. They of course originate from brown bottles that once held beverages (such as beer), or from older house hold cleaners such as bleach. Cleaning solutions these days seems to come only in plastic containers so these pieces of glass certainly can have some age to them
Check your larger glass pieces carefully for ingrained letters and numbering; Tell tale signs from whence the piece originated.
I have found quite a few tops of bottles, intact, and even a whole bottle wedged between rocks on rocky shore lines