Question

Why was there the demand for Indian indigo

Answer 1

Because the British have to make inks and supplies the indiogo to there country so that's why it is demand more rather than of taxes

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.