Silver Crest is a luminous, high-sheen milk glass with a crystal-clear wave on the rim. It’s cool and smooth–like icicles and snow.
Heirloom is an opalescent glass, pearly white with blue undertones that shift as the light changes. Under a black light in a dark room, the glass fluoresces light yellow–a telltale sign that the glass contains a small amount of uranium and is authentic vaseline glass.
Milk glass and opalescent glass are becoming hot collectables. Do an image search for decorating with milk glass and see if this isn’t true.