Black opaque was an experimental color and was never expanded for consumer use.Only a very few items were ever made in black, and to have one in your collection would be quite a find. They include the #351 Priscilla Oval Mayonnaise Underplate, the #1540 Lariat 8″ salad Plate, and a few pieces of #1637A Town & Country.
|Blue (Trial Blue)
Pastel blue is thought to be an experimental color made for special orders or testing on the market. This color is similar to some shades of Limelight or Zircon, but it has more of a blue tint. It is in extremely limited supply.Though not as limited as black, any of the following are items in Trial Blue would be a good find: #4085 Kohinoor 9 oz. Low Ftd. Goblet, #1435 Individual Ash Tray, #3368 Albemarle 5 oz. Sherbet.
A crystal glass with gold opalescent rims, this color is thought to have been experimental or used for small, special orders. Only a handful of pieces are known in this color. One item known is the #112 Mercury 3″ Candlestick.
An experimental color made for trial only, this color contains gold in the cranberry-effected coloring. For the most part, it found its way into the homes of the employees, since it was never produced for consumer use as far as we know. Gold Ruby is listed here not as a color to be collected, but as a point of interest. Under black light, it will fluoresce red.A known item is the #4220 Janice Vase Spiral optic.
See discussion under Limelight and Zircon above.