Fig. 2
From: High-resolution micro-CT with 3D image analysis for porosity characterization of historic bricks
Thin sections from each brick, mounted in blue-dyed epoxy so pores are blue, then scanned in a Pathscan Enabler 5 geological slide scanner (plane polarized light) at a resolution of 2.54 µm/pixel. Bright particles are silica minerals; fired clay matrix is black. A, B, and C (left) are the three modern hand-molded bricks, and D, E, and F (right) are the three historic bricks seen in Fig. 1