Karsanbhai Patel graduated with chemistry and worked as a lab technician at Gujarat’s geology and mining department. In 1969, he started an after-office business of detergent powder, made and packed in his backyard. Patel would sell these packets door to door for â‚¹3 per kg, a third of the price of leading detergents. It was an instant success. Patel’s Nirma brand of detergent, named after his daughter, created a new market segment and within a decade was India’s largest selling detergent.