A method is provided for storing a cooked food in a flexible-walled container having an opening. The particles produced with this method have a diameter between 10 nm to 300 nm, have a mono-disperse particle distribution, and are present in non-agglomerated form. Additional windows, with a protective transparent material covering each of the windows, located on other sides of the fold open display box may allow a full 360 degrees view of an object in the box.