Re: Screen magnifiers - 40s/50s TVs
ISTR that my comment about glycerine was something I spotted in a book or magazine years ago.
If glycerine was used and had a different refractive index, presumably the convexity of the front would need to be different as well.
I don't think it is flammable, but I do know that if you drip it on sugar, it will start to smoulder and burn. Do the same with potassium permanganate and it will burst into flames!
Now, putting the Useless Facts and Weird Tests section away for now, I would have thought it more likely that the yellowing is caused by sunlight on the plastic, not the liquid itself.
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Mike.
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