I made this vial/jar as part of working on a game about surgery. In the zip you will find seperate images for the jar, lid, and three images for the fluid top, mid, and bottom. By scaling the mid-image and moving the top-image to follow it, you can animate the fluid level of the jar changing. You can see an example of this in this tweet: https://twitter.com/DisMOSFET/status/1109716011001929728

Follow me there if you'd like to see future gifs/pester me about freeing other useful looking art bits :P.