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Originally posted by qmantoo
Does anyone know of a substance which will do this please?
Ideally it should initially be clear and then when it comes into contact with a certain frequency of light it should solidify or change colour.
Any links etc would be extremely helpful.
Originally posted by Romekje
reply to post by qmantoo
If you could find out what substance they use in self-darkening sunglasses i think u'd be on the right track.
Though i haven't got a clue what substance that might be
In the presence of UV-A light (wavelengths of 320–400 nm), electrons from the glass combine with the colorless silver cations to form elemental silver. Because elemental silver is visible, the lenses appear darker. Back in the shade, this reaction is reversed. The silver returns to its original ionic state, and the lenses become clear.
Yes, I did not think my 'idea' was necessarily unique at all. However, there is always room for a unique application of one technology using technology from a different area or discipline.
Medical science has lasers that can focus on a small point in three dimensional space.
Several lasers, each send part of the wavelength required and at the foci the lasers converge to form a complete wave at one localized point.
Unfortunately, for a 3d image......we need a medium on which to display it. In the past smoke has been used, as well as vacuum chambers filled with certain combinations of noble gases (argon, neon, etc).