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A dropping bottle is a type of lab glass item used to add a liquid or solution dropwise.
The dropping bottle consists of a small bottle with a ground glass joint, where a ground glass joint stopper with a slit is present. By rotating the stopper in the opposite direction, the stopper becomes open, though this feature is not universally present. It is often made of borosilicate or soda-lime glass.
Another type of glassware often called dropping bottle consists of a glass dropper with a rubber bulb inserted through a ground joint stopper resting on a small bottle with a ground glass joint. Other models have a screw cap. However, since the screw cap is often compatible with many other common glass bottles, and it's fairly easy to ram a glass bulb dropper through any stopper, this item can be simply considered a glass dropper with a bulb resting on any glass bottle, stretching the definition of a dropping bottle.
Dropping bottles are sold by lab suppliers and can also be bought online.
DIY dropping bottle
If you have a small bottle with a ground glass joint, and a damaged stopper, like a Winkler flask for example, simply carve a small slit along the ground glass joint, which should allow the liquid to flow dropwise.