It failed because, apparently, the bombers botched the kitchen-stove preparation of the ingredients, chiefly chapati flour, nail-varnish remover and hydrogen peroxide.

Odor Remover - Chemical solutions, like pain and varnish, have strong odors that can adversely affect your health when inhaled.

Approach the desk on the left (zoom). Take a copy of your book, a pen and from the bag: nail varnish, a remover and a cotton pad.