In order for a food to glow red under UV light, it must contain chlorophyll. Foods in this category are leafy green vegetables. While anything with soda water or tonic water will glow because of the presence of quinine, these items only glow a blue-white colour in UV light.
Leafy Green Vegetables
Chlorophyll is the chemical that glows red under UV light and is found in leafy green vegetables. Therefore, foods such as spinach, Swiss chard, mustard greens, lettuce, broccoli and spring mix salad will all glow red under UV light. You can mix up a salad with greens, then add white foods such as cauliflower, radishes and white cheese to get a red and white glow together. Vegetables that are not green will not glow red.
Blood Red Cocktails
Most cocktails with soda or tonic water will glow blue-white in UV light. This happens because of the quinine in the water. With a little added food colouring, they may glow green. Getting drinks to glow red takes a little more effort. You will need a lot of fresh spinach, a blender and a fine strainer. Blend the spinach with water in a blender. Strain the mixture to remove any chunks of spinach. You can now add the water to vodka or other clear alcohol to make it glow red. While grenadine does not glow, it can be added to tonic water or soda water and it will seem to glow red as the quinine glows.
Green Bell Peppers
Freshly cut green peppers fluoresce red under UV light. They must be cut in order to fluoresce red. Serving them with a white dip such as a ranch dip will allow them to glow white and red together.
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