The Butterfly mold from Colour de Verre casts a glass butterfly measuring 3 inches by 4-1/4 inches. Glass frit is loaded into the cavity and fired so it takes the butterfly shape, with a suggested fill weight of about 115 grams per piece. The mold is reusable across many firings when primed and cared for properly.
A notable feature of this design is that the wings can be slumped upward after casting, giving the piece a more dimensional profile. Finished butterflies work well as sun catchers, can be mounted on garden stakes for outdoor display, or used as decorative accents indoors. Like all ceramic casting molds, it is COE agnostic and works with any fusible glass.
What does the Butterfly mold make?
What COE glass can I use?
How much glass do I need?
How do I prep the mold before casting? ZYP BN Lubricoat or Hotline Primo Primer before every use and let it dry completely before adding glass. Colour de Verre recommends priming before every firing.
Specifications
SKU: 181671Manufacturer: Colour de VerreMakes: 1 glass butterflyFinished piece size: 3 inches by 4-1/4 inchesSuggested fill weight: about 115 gramsMaterial: ceramic kiln casting mold, reusableGlass: 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 the cavity with ZYP Boron Nitride Mold Primer or Hotline Primo Primer before every use and let it dry completely before adding glass.
Fill the cavity with frit to a total of about 115 grams. Weigh your glass for consistent results.
The mold is COE agnostic. Use a casting schedule matched to your glass.
To give the wings an upward, dimensional profile, slump the cast butterfly with the wings curving upward as described on the Colour de Verre project sheet for this mold.
Let the kiln cool fully before removing the cast piece. Re-prime the mold before the next firing.
Suggested Firing Schedule
This is a suggested starting point, not a guarantee. Every kiln fires differently. Follow the Colour de Verre project sheet for this mold and test a small run first.
Heat no faster than about 350 F (195 C) per hour to avoid thermal shock to the mold and glass.
Fire to no more than about 1450 F (785 C).
Add a controlled cool with an anneal soak for your glass: about 950 F for COE96, or about 900 F for COE90.
Helpful downloads: Priming Molds With ZYP Spray (PDF)
Description updated: July 6, 2026
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