Explanation of Ullman Colors

"Powder" - is a granulate finer than 1 ,00 mm

"Chips" - are granulates of 1,00 to 8,50 mm.

All Ullman color products can be used at regular working temperatures, i.e.: between 1150 to 1250 degrees C/ 2100 to 2280 degrees F. The annealing temperature is the one used for the base glass.

Powders, and chips may be used without preheating. The best way to apply them is by dipping them.

The Loetz colors are 5010, 5020, 5030, and 5040. The gold effect which makes them famous is obtained by gluing the powders andlor chips on the external surface of the glass, treating it first reductively, and then iridizing it. The reduction can be obtained by exposing the color-covered glass to a reductive atmosphere. When using Loetz colors in lampworking, iridizing is mostly not needed.

5010 - is a half transparent glass on lead crystal base of yellow basic color over-saturated with silver.
5020 - is a transparent glass on lead crystal base of blue green color, over-saturated with silver and copper.
5030 - is a transparent glass on a lead crystal base of green color over-saturated with silver and chrome.
5040 -is a transparent glass on a lead crystal base of grey color, over-saturated with silver and dulled with nickel.

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Site created August 15th 1999
Last update July 18th 2003