Yes, you can.

Some people have taken pu-erh tea, chrysanthemum tea, dragon well tea to do an experiment, after they brewed and placed respectively 12 hours and 24 hours, this time period is enough to meet the time we say overnight tea.

After testing found that Pu'er tea and chrysanthemum tea, whether placed 12 hours or 24 hours, which the nitrite content did not exceed the standard, are less than 0.2mg / L; Longjing tea nitrite content is slightly higher than the first two, to 0.26ml / L or so, but still lower than the national 1mg / L standard.

In fact, a cup of plain boiled water placed 24 hours after the nitrite content are higher than the tea, the reason is that the tea contains tea polyphenols and other antioxidants, can reduce the generation of nitrite, so do not worry.

Expanded

The color of overnight tea tea broth from yellow-green to yellow-red, because the theaflavin into thearubigin, although into thearubigin, but its antioxidant capacity has not changed, so do not worry about the tea broth discoloration.

The overnight tea is generally the previous night's tea, drinking tea in the morning on an empty stomach will cause stimulation of the gastrointestinal function of weak people, so add some hot water to blend it will be better.

People's Daily News - not poisonous! 3 truths for overnight tea "vindication"