In 1989 Tetley switched from the standard square bag to a round one, and a handful of years later it introduced the drawstring tea bag - which contains 30 different teas.

The researchers counted the plastic particles by cutting open bags of tea, removing the tea, rinsing off any pieces that might have come off during cutting, and then steeping the bags in distilled ...

Food & Drink Tea You're using tea bags all wrong – here's why the string has very important use The string on tea bags have always been there, but we've all been missing something pretty important.

And Verity explained that the choice to leave the bag in can also negatively affect the flavour of your brew. She said: "The longer you leave the tea leaves in the hot water, the more tannins come ...

Some tea bags release microplastic particles into the water Tea drinkers have been urged to avoid plastic tea bags after tests found that a single bag sheds billions of particles of microplastic ...