This image is released under a CC BY-NC-SA 4.0 Licence
Buy this image as a print
License this image for commercial use at Science and Society Picture Library
Green's 401 filter paper, 11cm, boxed, by J Green Ltd Science Museum Group © The Board of Trustees of the Science Museum
Green's 401 filter paper, 11cm, boxed, by J Green Ltd, Maidstone, England