Comparing Transparent Red Bricks

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.]