sample of a paper (Mierzinski sample 035) with four fibre types in the furnish, according to the recipe; 25% flax/linen (4), 25% cotton (5), 30% mechanical pulp (2), 15% chemical pulp (1, 3), and 5% kaolin (6). All of these can be found in the sample, and careful analysis shows that the chemical pulp consists of a blend of coniferous (1) and straw (3) pulp [micrographs and z-stack BvV].