mechanical coniferous pulp from a 1942 wood pulp board (sample 150 at 100x enlargement): fibre bundle (vertical fibres), bordered pits (circular dots) and ray cells (horizontal lines). Three positions (0°, 45°, 135°) rotated to the vertical of the 90° position, these give the approximate colours most fibre types will show. Arrows show the EW-direction of the fibres in the original micrograph. [micrographs and z-stacks BvV].