Gold Ruby (1932, experimental only)

This is very rare, probably only given to employees as gifts. It is said to fluoresce red under a black light.

Hawthorne (1927-1928)

Often mistaken for the lavender Alexandrite, Hawthorne was also purple but found in a wider variety of hues. You can distinguish the two in that under a black light Hawthorne will not turn blue. Darker purple to an almost brownish purple pieces are Hawthorne, not Alexandrite. This color is found in several shades, from lightest lavender to a brownish, muddy purple.  Compare to Imperial's Heather Color (note* Imperial used Heather in some of the Heisey molds it obtained in later years).

Ivory (1897-1910)

Along with Ivorina Verde, Ivory is referred to as Heisey's custard glass. Ivory was the lighter yellow (opaque) of the two. It will glow under a black light. Heisey produced a large quantity of custard glass and can often be confused with that produced by Northwood.

Ivorina Verde (1897-1910)

Darker yellow opaque glass than Ivory, Ivorina Verde is closer to what today's collectors think of as strictly custard glass. It will also glow under a black light. Very similar to Northwood's Custard glass.

Limelight (1955-1957)

A blue-green color which is identical to what Heisey called Zircon in earlier releases. The company always had some trouble controlling the shade of this color during production. Some Limelight can be identified by a more greenish hue, similar to ultramarine. All shades tend to fluoresce under a black light.

Marigold (1929-1930)

This color was a brassy amber gold. Due to production problems with this color, it was produced for only a short time. Heisey also produced an experimental Gold, distinguishable