Please let your method be from experience because of this report I recently read ”A postgraduate student in a local university prepared 450 mL of an electro-polishing solution by mixing concentrated nitric acid and ethanol in a 1:2 ratio as indicated in a published research paper. The student observed "no significant temperature rise" over 3 hours, he then capped the Winchester bottle and went home. About 4 hours later, the bottle exploded, scattering glass fragments to a distance of 12 meters and with enough force to break another Winchester bottle containing oil 1.75 meters away, and a plastic shield 4 meters away. Fortunately there was no one in the laboratory at the time, otherwise the powerful explosion could have caused serious injuries."