Dye sublimation is a printing technology that uses layers of transparent color dye, special dye-receptive paper and a heated printing head to create images that are pretty close in quality to conventional photographic film and paper--up to 16.7 million colors and 403 dots per inch by 403 dots per inch.

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To solve this problem, the researchers at the Max Planck Institute developed a technique using a fluorescent dye to make the spinal cord transparent, replacing the water that is normally there.

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