Birefringent specimens often reveal a spectacular display of color and crystal form upon illumination with polarized light. When Hoffman modulation contrast is added to the mixture, the colorful image takes on a three-dimensional appearance as illustrated below with crystallites of vitamin C.

Vitamin C is one of the most ubiquitous vitamins ever discovered. Besides playing a paramount role as an anti-oxidant and free radical scavenger, it has been suggested to be an effective antiviral agent by some very respected scientists. Although the antiviral properties of vitamin C remain the subject of great debate in some circles, this water-soluble vitamin remains one of the most popular and important vitamins. Vitamin C is commonly found naturally in peppers, citrus fruits, tomatoes, melons, broccoli, and green leafy vegetables such as spinach, turnip, and mustard greens. The primary function of vitamin is to assist in the production of collagen, although it is becoming rapidly identified as a key player in detoxifying the body from foreign substances. Although there is somewhat limited documentation, other reported uses of vitamin C are healing wounds and burns, accelerate healing after surgery, decreasing blood cholesterol, reduce blood clotting, offer protection against cancer agents, and extend life. Many of these reputed uses are highly speculative and lack the proper scientific verification.