**10.3 Bark**

Tamarind barks and leaves contain a yellowish or brownish bitter-tasting organic substance called Tannin. The bark has 70% of tannin and found a great place for its usage in the tanning industry. Bark tannins are utilized in the production of ink and the fixation of colors in Zambia [2]. Many other African countries use the bark to manufacture ink. Tamarind twigs are used as "chewsticks," while the bark is utilized as a "chewing gum" masticatory, either alone or as a lime replacement in betel nut [2]. Hordenine is an alkaloid found in the bark [20].

**Lac:** Tamarind tree is a host for lac insect that deposits a resin on the twigs. This product should be harvested and sold as a stick lac, but it is not considered an important source.

#### **10.4 Tamarind seed gum**

Tamarind gum is obtained from the endosperm of seeds of the tamarind tree, which is a seed gum with potential industrial applications [22]. Tamarind gum is having applications in paper, food, textile industry, etc. The composition of tamarind kernel, the source of gum, resembles the cereals. With 15.4% to 12.7% protein, 3–7.5% oil, 7–8.2% crude fiber, 61–72.2% non-fiber carbohydrates, 2.45–3.3% ash (d.b) [23].
