Just when you thought that Polaroids were finished with…
today’s invention is a low-cost sunburn avoidance tool.
A Polaroid sheet is tightly clamped within a container using a grid of bars which separate the sheet into separate windows. Each window has a light-impermeable hatch.
When sitting on the beach, one window containing a reference colour would be opened. The adjacent window would then be opened, exposing a calibrated square of film to the sun’s rays.
When the film square and the calibrated colour become visually indistinguishable, it’s time to head inside.