This tissue is not very common in life science applications, but allows a simple and inexpensive reference probe as described by Olevsko et al.: z-stack of commercial tissue paper labelled with a fluorescent highlighter pen (single-photon setup, 20x, 0.75 NA, FOV 665 x 665 µm) - 395 nm (yellow); z-stack: 1 µm stepsize.
The imaging session was inspired by this paper published on bioRxiv -
https://www.biorxiv.org/content/10.11...