From left to right:
- LEGO brick, mold number 224, in a light shade
- LEGO brick, mold number 224, in the regular shade
- LEGO brick, mold number 3 with cross-support and thick walls. Looking a bit darker than the brick on its left because of the wall thickness.
- BASF brick (old logo, mold pip bottom edge) in a dark shade
- BAYER brick (old logo, mold pip bottom edge) in a dark shade
[Original post and comments on Flickr.]