The colors are not completely filled in the recessed areas and the metal borders are much more visible. It fired at low heat to seal the colors and provide a lustrous appearance.
Both soft enamel and hard enamel are manufactured using the same procedure, but there is a slight variation in the drying process of the applied paint. Once the paint is applied, instead of subjecting it to intense pressure and temperature (as done for the manufacture of hard enamel pins), these pins are simply air-dried. A current of air is allowed to fall into the wet paint and hence the paint will dry! This is the functional difference between soft enamel pins and hard enamel pins,The difference does not end merely with the drying process.
hard enamel pins
soft enamel pins