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保存 = keep(ing), reserve(ed)
酵 = ferment(ation)
熟 = age(d)
茶 = tea

Generally, greentea is not fermented. So this name sounds strange for me.

Anyway, you might not know how to brew greentea with good taste.
Yellow color might be sign of "too high temperature" and be bitter.
For the first brewing, 70 degree C is the best for common grade greentea.
(For high class tea like Gyokuro or Fukamushi, it is 50 or 60 degree C)
At first pour boiling water to "cups" for cooling it down, put tea in the pot, then pour the water of the cups to the pot.(Brewing time: 40 or 50 seconds)

For the second or third brewing, boiling water and 20 seconds would be good.