The use of wash bottles is more convenient than using beaker and graduated cylinders. In addition, unwanted substances or particles cannot pass through wash bottles. The use of wash bottles helps researchers control and measure the precise amount of liquid used. Where reagents with high vapour pressure are used such as ethanol or methanol, small pressure release holes are incorporated into the cap to release and excess vapour pressure and avoid material being ejected through the nozzle when not in use. Safety warning labels are also used to identify potential hazards. Red is used for acetone, White for ethanol or sodium hypochlorite or distilled water, green for Methanol, yellow for isopropanol and blue for distilled water. There are a consistent set of colour codes and markings used to identify the contents of wash bottles. In biological labs it is common to keep sodium hypochlorite solution in a wash bottle to disinfect unneeded cultures. These include deionized water, detergent solutions and rinse solvents such as acetone, isopropanol or ethanol. Wash bottles may be filled with a range of common laboratory solvents and reagents, according to the work to be undertaken. Most bottles contain an internal dip tube allowing upright use. Most wash bottles are made up of polyethylene, which is a flexible solvent-resistant petroleum-based plastic.

When hand pressure is applied to the bottle, the liquid inside becomes pressurized and is forced out of the nozzle into a narrow stream of liquid. Wash bottles are sealed with a screw-top lid. The wash bottle is generally used in the clean-up phase of many experimentsДЄ wash bottle is a squeeze bottle with a nozzle, used to rinse various pieces of laboratory glassware, such as test tubes and round bottom flasks. They are filled with appropriate cleaning liquids, and poured over the tool that needs to be cleaned. To clean laboratory glassware and other equipment. Plastic wash bottles for ethanol and water

Squeeze bottle