Cobalt Blue Bottle

Use the selected blue glass in the formula's stability evaluation before making that substitution. Ask for material and color specifications, plus relevant optical data if protection is required. The blue appearance is a design feature and does not establish equivalent protection for every ingredient.

Approve filled and empty appearance samples together, including the chosen closure and any coating. Agree how the body color will be judged under consistent lighting. Keep a physical reference so glass color and printed artwork can be reviewed as one finished presentation.

First compare the bottle's complete neck dimensions with the proposed dropper collar and seal. Specify pipette clearance and withdrawal behavior, then test filled assemblies. A visually similar blue bottle from another mold may require a different closure or pipette length.

Inspect the final parcel pack for glass contact marks, chipped finishes, and rubbing on printed areas. Include the blue bottle's actual closure and filled weight in the trial. Record cosmetic defects separately so the presentation standard is clear before approving protective packing.