If you could prevent the normal scattering at the interface, you could reveal the structures underneath, effectively rendering skin transparent. [Zihao Uo] and others demonstrate this in a paper ...

As for the tool anatomy: The top portion houses the flexible suction tip, while the bottom half is bifurcated into plastic ...

Illustration of skin tissues rendered transparent following saturation by FD & C Yellow 5. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert!

A beam of sunlight shines down through a leaf and the translucent skin of a tiny reticulated glass frog clinging to its underside ... They will also fend off predatory wasps intent on taking the eggs.