Indian Patent Stone was the name given to polished concrete floors that were made with cement, sand and granite chips. And the same can be found in many places all over Calcutta.
This floor of New Market was made by Bird and Co who had their offices in Clive Row and have the distinction of being Amitabh Bachchan’s first employer.
Ready Mix Concrete and Its Decorative Uses; Decorative Concrete Stain: Floor Design Choices Are Now Unlimited; Polished and Decorative ConcretePolished concrete floor New York
it’s a great hand made stone. it is very strong stone