The Saffman-Taylor instability occurs when a less viscous fluid is inserted into a more viscous one within a confined geometry. This image is the result of inserting water mixed with food coloring into honey inside of a Hele-Shaw cell. The cell was created using two clear acrylic plates that were held together using clothespins. Honey was compressed between these two plates where red water in a syringe would then be forced into a drilled hole on the plate creating the effect.
Canon EOS Rebel T7
Focal Length: 44 mm
Exposure Time: 1/100
A video is also provided below to see the process of producing the image:
iPhone 13 Pro
Captured at 4k and 60 fps but reduced to 1080p for YouTube
Credits: Bradley Schumacher and Qisheng Lei for assisting with the experiment