when/where was invisible glass first invented?

in Egypt about 100AD

https://en.wikipedia.org/wiki/History_of_glass

its naturally formed with sand being heated....and melted together and man made the same way by melting sand at super high temperature to make it ........then theres another type made out of silica but the process is the same .heat heat heat

Glass has been around since the time of the Egyptians but it is only when you get to the 17th century that you get improvements in transparency, promoted by people like George Ravenscroft in England. Plate glass was developed in the mid 19th century by James Hartley with his cylinder method used to great effect at the Crystal Palace in London. Float glass was developed in the US and marketed worldwide by Pilkingtons. This had better transparency and was used extensively from 1960s and is still being produced. It is never truly invisible, of course, but near enough.

At the invisible glass factory.

Glass is TRANSPARENT. That does not mean "invisible". It is perfectly visible, that is why thousands of people do not walk into glass doors, or through windows, every day. (Of course, there are the occasional idiots whose attention is elsewhere or who do not look where they are going, that just means that they are dumbos, not that glass is invisible.)

Good question. I also wonder that about mirrors.