Pour the chilled cranberry juice and apple juice into a large pitcher, creating a deep red base for the punch.
Add the simple syrup to the juice mixture, stirring gently with a mixing spoon until well combined and slightly thickened.
Introduce 2 to 3 drops of red food coloring, adding sparingly to achieve a vivid, blood-red hue. Stir once more and observe the color intensify.
Once the mixture is uniformly colored, taste and adjust the sweetness or color if needed. For extra sparkle, gently pour in the club soda just before serving, stirring lightly.
Fill glasses with ice cubes and ladle the vampire punch over them, allowing the chilled, vibrant drink to shimmer in the glass.
Enjoy immediately to experience the refreshing, festive, blood-red glow of the Vampire Punch.