Thompson Medium Temperature, Medium Expansion enamels are a glass product formulated to create a permanent bond with fine silver, copper, and gold. Bronze is not recommended for enameling.
These high quality, acid-resistant, 80-mesh enamels will provide rich, beautiful color for your metal clay work. Thompson enamels are all lead-free! See below for more information...
The general firing range for Thompson enamels is 1400°1500°F (760°815°C). Enamels will fuse in 1 to 4 minutes depending on the color, type and thickness of the metal, and the temperature of the kiln. A typical firing is 1450°F (790°C) for around 2 minutes. Enamel powders will change in color after firing. Refer to the color image for a general indication of the fired result. Computer monitors do not accurately represent color, and enamel colors may vary slightly from batch to batch, so pre-testing your enamels before using them is recommended. Bronze is not recommended for enameling. The enamels are not formulated to adhere to it and will crack or chip off.
Color Specific Information:
Additional Firing Notes:
- Color: 2838 Red
- Metals: Recommended for fine copper and gold. May be fired on silver with caveat. See additional firing notes below.
- Recommended Firing Range: Consistent with general firing range.
- Firing: Consistent with general firing times.
- COE: 350 cubic expansion
- Grade: 80 Mesh
- Type: Transparent Color Code: (G) contains Gold
This color is reactive on both copper and silver. Copper: This color will turn dark and opaque if fired directly on copper. Firing over a flux layer will eliminate the problem as can be seen on the copper sample pictured. If firing over clear, the initial firing should be 1550°F (845°C) to clear the oxides off the metal. The copper should appear clean and bright under the enamel. If it appears reddish or mottled it wasn't fired hot enough and/or long enough. Refire at high temperature. Subsequent color firings should be at lower temperatures. Silver: Although the color reacts, the result is not unattractive and can be used for effect. It can also be fired over clear to mitigate the effect somewhat. The sample was fired on sheet metal. Color reaction will be magified on metal clay due to porosity, and bleed through is likely even through flux coats. Be sure to test before committing a piece. Overall, this is not a color recommended for silver for those less experienced with enameling. It's important to become comfortable and achieve some level of success with the Standard and (A) colors before trying the more challenging colors.
©2013 - The color notes presented here are the intellectual property of Pam East and reproduction in whole or part in any form requires written permission.