A very small amount of Apiezon ® stopper grease applied to stopper

By St. Petersburg Coastal and Marine Science Center 2012 (approx.)

Photo of the stopper held between thumb and fingers with tiny dabs of stopper grease in 2 dabs

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Detailed Description

A very small amount of Apiezon ® stopper grease is applied to the ground glass of the stopper to form a gas-tight seal.

Sources/Usage

Public Domain.