This video outlines tips on how to carry out the modified Herzog check (purple plate check) utilizing an ordinary polarisation microscope with a purpose to establish plant fibres.

Picture: Truls Andersen
Editor: Hazel Gardner
Voice and Performing: Hazel Gardner
Journalist (Script): Hazel Gardner, Bodil Holst
Graphics: Einar Haugan, Bodil Holst, Hazel Gardner
Technical Help: Melanie Ostermann