i need some science fair project ideas on tea?

Answer 1

Tea can be used as an acid/base indicator.
When you add lemon to tea it changes the color.
You could expand that to include other acids and then see if adding a base had any effect.

Answer 2

Go to Stashtea.com or call them at 1-800-826-4218. The website has a history of teas from around the world and much more information that should be helpful to you..