From: poutnik@privacy.net   
      
   Dne 13/04/2018 v 16:50 Peter Percival napsal(a):   
   > When Proustite (Ag_3AsS_3) is exposed to light it changes from being red   
   > and transparent to being black and opaque.  What is the chemistry of   
   > this transformation?   
      
   My understanding is it is analogical to self dimming glass,   
   or to a film silver halide latent process.   
      
   The light releases free electrons from sulphide   
   and creates metallic silver.   
      
   In case of film, free halogens are captured by auxiliary organics.   
      
   In case of glass,   
   there is running reverting silver halogene recombination.   
      
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