Types of Tea
11 Jan 2009
Types Of Tea
Ok, so we should talk a little bit about how teas are processed. “Why”, you ask? Well, the way tea is processed determines the type of Tea it becomes. So, lets say I am a coffee nut and am just exploring the world of tea. If I don’t know anything about it, I will have a hard time determining which tea would be right for me. Besides, I really like to know at least a LITTLE about something before I buy it. So, here we go. I have given you some pretty good information and some suggestions for your tea journey. Give them a try. Remember, as a general rule, the more processed the tea, the stronger and more caffinated it is. Black, Oolong, Green and then White.
To ensure the highest quality teas, the newest “two leaves and a bud” of tea plants are plucked by hand. This practice of fine plucking produces the best tasting tea but low yields – around two to three thousand leaves only translates into a pound of finished product.
Just as pruning a flowering bush, this repeated picking of the young leaves and buds promotes new growth throughout the year. Depending upon the origin, bushes are plucked anywhere from three to twelve times a year. Plucking is often referred to as “flushes.”
Four Major Kinds of Tea
Of the four major types of tea, including black, oolong, green and white, all originate from the Camellia sinensis tea bush. The differences among the teas result only from the way the plucked leaves are processed.
Black teas
Making black tea involves withering, rolling, oxidation and drying. Withering – Workers start picking early in the day and usually return to the processing factory around mid-day. These freshly harvested leaves are spread out on racks and left to wither for 14 to 24 hours. During this withering process, the leaves become soft and pliable loosing much of their water weight due to evaporation.
Rolling – Next, from the racks leaves are fed into rolling machinery that break up the cellular structure and release the natural enzymes of the leaf. An elliptical motion created by large rollers exerts just enough pressure to roll and twist the leaf without causing heat damage. The resulting product is a green, pungent pile of twisted tea leaves.
Oxidation – After the rolling, the leaves are transferred to a cool, humid location in the factory to begin the oxidation process, also commonly known as the fermentation process. Over the next two to three hours, the leaves release their enzymatic juices and oxidize upon exposure to air. A chemical reaction occurs whereby the mixing of polyphenols and pectin with oxygen and enzymes cause the leaves to turn black and also give black tea its characteristic flavor. Determining how long to oxidize the leaves involve considerable expertise and different styles of black tea demand varying time for fermentation.
Drying – Upon the reaching the optimal oxidation level, the leaves are fired or dried to stop the fermentation. In essence, the drying seals in that particular tea’s characteristic flavor. Placed on large trays or on a conveyor belt, the tea travels through an oven chamber that halts oxidation and reduces the leaves water content to an ideal 2%.
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Oolong Teas
Oolong teas are partially fermented teas. They sit halfway between black and green tea.
Oolong teas are withered for a shorter period of time. The wilting is done by shaking the leaves in bamboo baskets to slightly bruise and tear the leaves so the enzymes can react with the oxygen, and turn darker in color.
The leaves are fired to stop oxidation and the length will determine the type of oolong.
Green Teas
Green tea differs from black tea in that after plucking, fresh leaves are immediately steamed to stop any oxidation. In Japan the leaves are steamed and in China, the leaves are pan-fried. The active enzymes are now locked into the leaf and it is ready for rolling.
Rolling in green teas determines the unique size and shape of the Green tea leaf. The growing location will dictate the style of rolled tea-resulting shapes include long thin leaves, tight balls, flat natural leaf and gently twisted green teas. The beauty of a tea and the taste profile is affected by the style and tradition of rolling.
Finally a gentle heating allows the leaves to dry, preserving their fresh “green” characteristics. The green tea leaves will have a higher moisture content that black tea leaves.
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White Teas
White teas are the least processed of all teas. The youngest buds are freshly plucked and them air of steam dries. Because the buds are plucked young, white teas are not produced in the abundance of black and green teas, thus commanding a much greater price.