My name is Timothy Gattie and I am a senior at the University of
 Pittsburgh.  I am participating in a senior design project in the Civil
 Engineering Dept.  My goal is to design a glass recycling facility.  I
 was hoping that you could supply me with some information on glass.  i
 need to know if there are any differences in the material properties of
 flint, amber and green glass other than color. i.e.density.  Your help
 would be greatly appreciated.

                                             Tim Gattie