Birefringent regions of indeterminate structure occur in the cholesteric mesophase of liquid crystalline DNA samples exposed to high magnetic fields. The photomicrograph presented above illustrates a region having strong birefringence and exhibiting a wide spectrum of higher order colors, which may be due to thickness variations. The magnification is approximately 75x, and the image was recorded on Fujichrome 64T transparency film using a Nikon Optiphot-Pol microscope with crossed polarized illumination. Exposures were recorded about 3 f-steps under the recommended value given by an in-camera photomultiplier and were push-processed approximately 1.5 f-steps in the first E-6 developer.