Most harvested tea leaves are steamed for thirty seconds. This is the usual traditional Uji/Kyoto style. However one variety, 'Fukamushi' Sencha, is steamed for forty-five to sixty seconds.
'Fukamushi' means 'to steam heavily', and the tea leaves appearance is crumbled or broken apart into smaller pieces. Therefore 'Fukamushi' Sencha is more easily extracted than other teas, so it takes less time to brew a strong and flavorful cup of tea. It produces a light green color, unlike Basic Sencha's light yellow color. Also 'Fukamushi' Sencha has a more mellow taste than Basic Sencha.
'Fukamushi' Sencha is also suitable for Iced Sencha because it's quickly and easily extracted in hot or cold water and always makes a flavorful cup of tea.
And the nutritious constituent of tea leaves are easily extracted into cups.
Sencha Fukamushi is brewed in a shorter time than standard steamed Sencha (finished in the traditional Uji/Kyoto style). For a really tasty cup of tea, brew Sencha Fukamushi for 40 to 45 seconds. If you brew for longer time, unfortunately you feel a little bitter taste