Made of Type I borosilicate glass, black.

• For light sensitive samples
• With glass Robotic stopper
• Additional opaque black cap

This is a standard 300 ml BOD bottle with black PVC plastic coating that blocks all visible light up to 800 nm. This inhibits the production of oxygen by algae. We recommend this bottle for use in marine photosynthesis projects in which you need to compare oxygen in a light and a dark bottle.