Bloody Broken Glass Cupcakes

INGREDIENTS

• 1 (18.25 ounce) package white cake mix
• 1 cup water
• 1/3 cup vegetable oil
• 3 eggs
• 1 (16 ounce) can white frosting
•  
• Sugar Glass:
• 2 cups water
• 1 cup light corn syrup
• 3 1/2 cups white sugar
• 1/4 teaspoon cream of tartar
• Edible Blood:
• 1/2 cup light corn syrup
• 1 tablespoon cornstarch
• 1/4 cup water, or more as needed
• 15 drops red food coloring
• 3 drops blue food coloring