Making glass stronger with….food preservatives?

This is an extremely interesting scientific demonstration by Ben Krasnow at Applied Science on why materials like glass breaks, but most importantly how you can improve the strength of the glass by a very simple process. Other similar hard materials like pure concrete, wood and cast iron breaks in exactly the same manner, but glass is one of the few materials whose strength can be increased through a simple chemical process. The only chemical needed is called potassium Nitrate (Saltpeter) which is a common food preservative and readily available to the public! It’s amazing how much difference a bit of scientific knowledge can make.