How droplets of oil or water can glow vibrant colors
The effect is a type of iridescence, with different colors seen at different angles
![microscopic water droplets showing iridescent rings of colored light](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/03/030519_mt_oildrops_feat_REV.jpg?fit=860%2C460&ssl=1)
DYNAMIC DROPLETS When illuminated with white light, microscopic water droplets emanate iridescent rings of light whose color depends on the drops’ shape and size, as well as a viewer’s perspective.
Zarzar Lab/Penn State