This viral DIY craft uses a clever, low-cost kitchen staple—cornstarch—mixed with school glue and food coloring to create a translucent, luminous medium that mimics the rich, glowing colors of authentic stained glass when held up to the light.
When shaped into floral hearts and botanical designs, the mixture dries into a gorgeous, glass-like finish that catches sunlight beautifully on windows.
How to Make Cornstarch Faux Stained Glass Floral Hearts
What You Need:
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Cornstarch: 1 tablespoon
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Clear School Glue (PVA): 2 to 3 tablespoons (brands like Elmer’s Clear work best)
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Liquid Food Coloring or Gel Dye: Your choice of floral colors (reds, pinks, purples, greens)
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Black Puffy Paint or Dimensional Paint: To create the raised “cames” or lead lines of the stained glass design
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Plastic Sheets or Sheet Protectors: To work on (the mixture peels right off plastic once dry)
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A Toothpick or Skewer: For swirling colors
Step-by-Step Instructions:
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Draw Your Floral Heart Template: Draw or print out a template of a heart filled with flowers and leaves. Slip the template underneath a clear plastic sheet protector or smooth piece of acetate so you can trace over it.
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Create the “Lead” Outline: Take your black puffy paint and carefully trace all the outline lines of your floral heart design directly onto the plastic sheet. Make sure the lines are raised and connect completely to form closed “wells” or sections for each petal and leaf. Let this dry completely (usually a few hours or overnight) until it feels rubbery and firm to the touch.
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Mix the Stained Glass Medium: In small separate cups or a palette, mix 1 tablespoon of clear school glue with a small pinch of cornstarch for each color you want to use. The cornstarch gives the mixture its milky, semi-translucent body that dries with a frosted, cathedral-glass texture.
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Add Color: Add a few drops of liquid food coloring or gel dye to each glue-cornstarch cup and stir gently until smooth. Don’t worry if it looks a bit cloudy; it dries clear and vibrant.
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Fill the Sections (Puddle & Swirl): Using a small brush, pipette, or the tip of a toothpick, carefully drop the colored mixture into the black-outlined sections of your floral heart. Fill each section until the liquid touches the black borders. Use a toothpick to gently swirl or blend colors if you want shaded petals.
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Dry and Peel: Place your tray in a flat, dust-free spot to dry for 24 to 48 hours. As the water evaporates, the cornstarch and glue mixture will shrink slightly, turn completely transparent, and lock into a flexible, glass-like sheet. Once fully dry, gently peel your floral heart away from the plastic sheet.
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Display: Press your finished faux stained glass hearts onto a sunny window—static cling or a tiny dot of clear tape will hold them in place—and watch them glow like real stained glass when the sun shines through!
