Sandwich glass was made of silex, ash, nitre, pig lead, and other ingredients but the secret of the bright surface on old pressed glass, a characteristic which differentiates it from the modern pressed glass, was the use of barytes. This was introduced into the molten mass and gave the beautiful silver tint that we find in early glass. The New England Glass Company omitted this barytes from its glass with resulting dullness. Its specimens are all crude and heavy in comparison with the lacy examples of early Sandwich.