the.com/ultraviolet
Light too cool for your eyes but warm enough to ruin your skin.
means Electromagnetic radiation just past violet on the spectrum, invisible to humans but high-energy enough to cause sunburn and fade colors.
from From Latin ultra (beyond) plus violet, literally the light lurking beyond the violet end of the rainbow, named by physicist Johann Ritter in 1801.
Bee visionBees see UV patterns flowers paint as landing strips.
Scorpion glowScorpions fluoresce eerie blue-green under UV light.
Vitamin makerUVB rays trigger skin to produce vitamin D.
Banknote secretHidden UV-reactive ink foils counterfeiters.