You can literally write with water. Soak some filter papers in the pink solution of cobalt chloride and then dry them in the sun. The dry filter papers will look bluish. Write on the blue filter papers with a water brush. Whatever you write will appear pink. A chemical reaction will make the cellulose in the paper turn pink. This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access o
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