Although glass is valued for its purity and chemical inertness, certain conditions can foster interactions between a container and the product. Utilizing untreated bottles for certain alcoholic products with an approximately neutral pH might cause it to “snow” in July. Alcoholic beverages, such as vodka or gin, are generally not buffered against changes in pH.  Over time, alkali leaching from the glass can cause the pH of the product to increase, which becomes more alkaline. If the pH rises high enough, the solution will attack the glass surface, resulting in siliceous glass flakes or particles in the product.