What is the story of Neel Darpan?

"Neel Darpan" is a play written by Dinabandhu Mitra in 1860, which highlighted the cruel exploitation and oppression of indigo farmers by British indigo planters in colonial India. The play depicts the sufferings of indigo farmers due to forced indigo cultivation and the use of 'Neel' (indigo) as a metaphor for the British colonial rule in India. The play played a significant role in raising awareness about the plight of these farmers and contributed to the indigo revolt.