Grey. Completely opaque. For all photosensitive materials whether liquid or solid.
With holes on the shoulder of the bottle for attaching security seals. Sloping shoulders reduce likelihood of residue deposits.

Bottles narrow-mouth
Winchester bottles
Bottles narrow-mouth
Winchester bottles
Bottles narrow-mouth
Winchester bottles
Bottles narrow-mouth
Winchester bottles
Bottles narrow-mouth
Winchester bottles
Bottles narrow-mouth
Winchester bottles