They can dissolve cellulose into carbon disulphide and this process allows complete removal of lignin and it is drawn into viscose strands. (rayon) https://en.w

They can dissolve cellulose into carbon disulphide and this process allows complete removal of lignin and it is drawn into viscose strands. (rayon) https://en.wikipedia.org/wiki/Rayon https://en.wikipedia.org/wiki/Rayon there are several processes. There may be even better ones to discover. If these clear fibers are embedded in a clear curing resin under vacuum it may be possible to make a very clear pane by matching the refractive index of the viscose strands and the polymer. With a very close match in indices and zero scattering voids in the strands, it should be possible to make a very clear fiber reinforced panel.