Stratified flows are ubiquitous in nature and engineering systems ranging from the Earths atmosphere to heat exchangers, significantly influencing how pollutants are transported and how heat is mixed. This proposal offers a novel method to study these flows using fluids at supercritical pressure where strong property variations occur just withing small changes in temperature. By combining analysis, numerics, and advanced optical measurement techniques, we aim to gain a better understanding of the complex phenomena of strongly stratified flows to enhance our predictive capabilities where conventional methods fail.