Once cooled, the enamel needs to be polished to achieve a glassy finish. It can also be applied as a paste and can be transparent or opaque when fired.
Vitreous enamel has many wonderful properties: it’s smooth, hard, chemically inert and can take on bright, jewel like colors that last through the ages. The primary drawback is its tendency to shatter or crack when struck or when the metal base is bent. This is probably the reason we have no examples of enamel thimbles prior to the 18th century, even though we have