Black tea contains tanning agent, which goes into solution on longer infusion times . Tanning agent changes colour according to the pH value. It forms flocculent precipitates with proteins and metal ions, and is therefore used as a clarifying agent. To determine the differences in taste of tea which has been allowed to infuse for various times, the same tea sort should be poured into cups after 2, 4, 6 and 8 minutes for the students to taste.
What you can learn about
- Ingredients of tea
- Properties of tanning agents
- Easy teaching and efficient learning by using interactive experimentation PHYWE-Software
- Experiment is part of a complete solution set with experiments for the topic Food Chemistry matched with international curriculum: all topics are covered