Question

By the end of 18 century the demands for indian indigo went up why

Answer 1

a blue dye called woad was grown all over the world. it gave a dull blue colour. people prefered rich blue colour of indigo, but indigo needed a very fertile soil to grow, and thus it was very expensive too.seeking the advantage of this,the east india company forced the cultivators to grow indigo as it would bring them a vast revenue. the cultivators had to grow indigo where they prefered to grow food crops.

The climate of Britain was not suitable to support the growth of indigo and they needed indigo as a raw material to feed the growing textile industries in Britain  . Thus they turned to their colonies for the supply

Answer 2

Indigo was in popular demand in Italy, France and Britain as a dye by the 13th century. However, due to its high price, attempts were made to replace it by another plant woad which was grown in Italy France, Britain, etc.

Also, the plant woad, which was grown in other countries, which they were replacing with Indian Indigo was of dull colour. The dull and pale colour of woad once again increased the demand for Indian Indigo.