Scientists used yellow food dye commonly used in corn chips and other snacks called FD&C Yellow 5 to make organic tissue transparent.

For now, it only works well on mice but looking ahead, this technology could make veins more visible to draw blood or inject fluids, especially in elderly patients with hard-to-see veins.

https://theconversation.com/yellow-food-dye-can-make-living-tissue-transparent-these-methods-could-one-day-improve-cancer-treatment-blood-draws-and-even-tattoo-removal-236746
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Yellow food dye can make living tissue transparent − these methods could one day improve cancer treatment, blood draws and even tattoo removal

New research demonstrates that the dye that gives nacho cheese its yellow-orange color can also make mouse skin see-through.

^{The Conversation}