2012 First-Class Forever Stamp,Earthscapes: Salt Evaporation Ponds
# 4710f - 2012 First-Class Forever Stamp - Earthscapes: Salt Evaporation Ponds
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4710f - 2012 First-Class Forever Stamp - Earthscapes: Salt Evaporation Ponds
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U.S. #4710f
2012 45¢ Salt Evaporation Ponds
Earthscapes
2012 45¢ Salt Evaporation Ponds
Earthscapes
Issue Date: October 1, 2012
City: Washington, DC
City: Washington, DC
Quantity: 2,670,000
Printed By: Banknote Corporation of America, Sennett Security Products
Printing Method: Offset
Perforations: Die Cut 10 ¾
Color: multicolored
A patchwork of salt evaporation ponds lies along San Francisco Bay, ranging in color from the blue green of the ocean to deep red.
Every year, 600,000 tons of salt are processed from these pools. It takes about five years for the power of the sun and the ocean winds to change water from the bay into salt crystals.
During the evaporation, the brine, or salt solution, goes through color changes because of the microorganisms living in the liquid. When the process begins, green algae thrive. As the salt content increases, brine shrimp change the water to shades of orange. Pools that are almost ready for final processing become red as a class of algae called halobacteria grows.
As the concentration of salt increases, the water is moved closer to the final stage, the crystallizer beds. The purified finished product has more than 14,000 commercial uses, including cheese and butter making, water conditioning, and table salt.
The tiny organisms in the ponds attract more than 70 types of birds, including endangered species, to the salt ponds. Wading birds take advantage of the shallow pools to find a satisfying meal, making the salt evaporation ponds beneficial to humans and wildlife alike.
U.S. #4710f
2012 45¢ Salt Evaporation Ponds
Earthscapes
2012 45¢ Salt Evaporation Ponds
Earthscapes
Issue Date: October 1, 2012
City: Washington, DC
City: Washington, DC
Quantity: 2,670,000
Printed By: Banknote Corporation of America, Sennett Security Products
Printing Method: Offset
Perforations: Die Cut 10 ¾
Color: multicolored
A patchwork of salt evaporation ponds lies along San Francisco Bay, ranging in color from the blue green of the ocean to deep red.
Every year, 600,000 tons of salt are processed from these pools. It takes about five years for the power of the sun and the ocean winds to change water from the bay into salt crystals.
During the evaporation, the brine, or salt solution, goes through color changes because of the microorganisms living in the liquid. When the process begins, green algae thrive. As the salt content increases, brine shrimp change the water to shades of orange. Pools that are almost ready for final processing become red as a class of algae called halobacteria grows.
As the concentration of salt increases, the water is moved closer to the final stage, the crystallizer beds. The purified finished product has more than 14,000 commercial uses, including cheese and butter making, water conditioning, and table salt.
The tiny organisms in the ponds attract more than 70 types of birds, including endangered species, to the salt ponds. Wading birds take advantage of the shallow pools to find a satisfying meal, making the salt evaporation ponds beneficial to humans and wildlife alike.