The Chemistry Behind Black Powder (Video) (IMAGE) American Chemical Society Caption Old school gunpowder is really called 'black powder,' and it was so crucial to the Revolutionary War effort that we went to great (and gross) lengths to try and make it. This week on Reactions, find out what exactly those lengths were: http://bit.ly/july4thchemistry. Credit The American Chemical Society Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.