The Flaming Hearts mold from Colour de Verre casts two heart shapes from glass frit in a single firing. The hearts measure 4.25 inches (108 mm) and 3.75 inches (95 mm) tall. Finished pieces work well as standalone decorative art, set on a desk or hung in a window, and they also serve as embellishments for votives, platters, and mosaics.
The mold footprint is 8 inches by 6 inches by 1.25 inches deep (20 x 16 x 3 cm). Colour de Verre lists fill weights of 80 grams and 100 grams for the two cavities. Like all ceramic casting molds, it is COE agnostic and reusable across many firings when primed and cared for properly.
What does the Flaming Hearts mold make?
It casts two heart shapes, one 4.25 inches (108 mm) tall and one 3.75 inches (95 mm) tall, in a single firing. The hearts can stand alone as decorative art pieces or be used as embellishments for votives, platters, and mosaic work.
What COE glass can I use?
Any COE. Ceramic casting molds are COE agnostic, so the same mold works with COE96, COE90, or other fusible glass. Match your firing schedule to the glass you are using.
How much glass do I need for each cavity?
Colour de Verre lists fill weights of 80 grams and 100 grams for the two cavities. The source does not explicitly assign each weight to a specific heart, so weigh your glass carefully and test a first run to confirm fill levels.
How do I prep the mold?
Prime the cavities before every use with a mold primer such as ZYP BN Lubricoat or Hotline Primo Primer, and let it dry completely before adding glass.
Specifications
- SKU: 181864
- Manufacturer: Colour de Verre
- Makes: 2 heart shapes per firing
- Finished piece sizes: 4.25 inches (108 mm) and 3.75 inches (95 mm) tall
- Mold size: 8 inches L x 6 inches W x 1.25 inches deep (20 x 16 x 3 cm)
- Fill weights: 80 grams and 100 grams (two cavities; source does not assign each weight to a specific heart)
- Material: ceramic kiln casting mold, reusable
- Glass: any COE (COE agnostic)
Working Notes
These are guidelines, not guarantees. Every kiln fires a little differently, so test a small run first when the result matters and follow the Colour de Verre project sheet for this mold.
- Prime both cavities before every use with a mold primer, either ZYP Boron Nitride Mold Primer or Hotline Primo Primer, and let it dry completely before adding glass so the cast pieces release cleanly.
- Fill the cavities with glass frit. Colour de Verre lists fill weights of 80 grams and 100 grams for the two cavities. Because the source does not explicitly assign each weight to a specific heart, weigh each cavity carefully and test a first run to confirm fill levels.
- The mold is COE agnostic. Use a fusing schedule matched to your glass and adjust the anneal soak for your COE.
- Let the kiln cool fully before removing the cast hearts. Re-prime the mold with your chosen primer before each subsequent firing.
Colour de Verre Suggested Firing Schedule
This is a suggested starting schedule based on Colour de Verre's general guidance, not a guarantee. Every kiln fires differently. Follow the Colour de Verre project sheet for this mold, test a small run first, and adjust for your glass and kiln.
- Ramp rate: heat no faster than about 350 F (195 C) per hour
- Top temperature: no more than about 1450 F (785 C)
- Anneal soak: about 950 F for COE96, or about 900 F for COE90
- Cool: controlled cool to room temperature before opening the kiln
Helpful downloads: Priming with ZYP Spray (PDF) · Tricks of the Trade (PDF)
Description updated: July 6, 2026
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