(a) Growers of woad in Europe saw indigo as a crop which would
provide competition to their earnings.
(b) The demand for indigo increased in the late-eighteenth-century Britain
because of the expansion of cotton production as a result of industrialisation, which
in turn created an enormous demand for cloth dyes.
(c) The international demand for indigo was affected by the discovery of
synthetic dyes.
(d) The Champaran movement was against the indigo planters.