Topics
Formats
The site
4 articles
Darkness, color, mirror coatings and polarization all change how sunglasses look and feel. None of them tells you whether the lens blocks ultraviolet light.
A gown sealed before an invisible stain is fully removed can yellow for years unnoticed. What museum textile conservators recommend instead of a never-open box.
Two prints can look identical on arrival and differ by years, sometimes decades, in how long they stay looking that way. The variables are ink chemistry, paper acidity and what glass you put in front of them.
SPF 50 is tested at 2 mg per square centimeter. Studies of real use repeatedly find people apply a quarter to a half of that — and protection falls at least as fast as the amount does.
