Quote:
Originally Posted by j.p.s
You know very well that the black and white spheres in e-ink are suspended in a liquid and that the reason the screen doesn't change unless power is applied is because the display is bi-stable. The recommendation to freeze is to literally put it in a freezer (after wrapping it in something dry).
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Unlike water, the liquid in the capsules or cups does not expand enthusiastically as the temperature drops so the chances of rupturing a capsule are pretty low. However, the viscosity of the liquid does increase which makes it almost impossible to change the display at lower temperatures. The last datasheet I looked at gave -25°C as the low storage temperature which is bit colder than most people's freezers unless you happen to be storing Pfizer's Covid-19 vaccine.
I did chill one ereader to 1°C and the display was extremely slow to change.
And yes, I do know that eInk screens are bistable. OTOH, I have seem quite a few posts from people who seem to think their screen is frozen since it doesn't change despite the battery being dead and/or removed.