Exposure Process
When the glass is exposed to UV light in the wavelength range 280–320 nm, a latent image is formed. The glass remains transparent at this stage, but the its absorption in the uv range of the spectrum increases. This increased absorption is only detectable using uv transmission spectroscopy. The reason behind this is suggested to be an oxidation reduction reaction that occurs inside the glass during exposure in which cerium ions are oxidized to a more stable state and silver ions are reduced to silver.
Read more about this topic: Photosensitive Glass
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