Editing Universal indicator (section)

== Types ==

* Paper form: It is a strip of coloured paper which changes colour to red if the solution is acidic and to blue, if the solution is basic. The strip can be placed directly onto a surface of a wet substance or a few drops of the solution can be dropped onto the universal indicator using dropping equipment. If the test solution is of a dark colour, it is preferable to use a paper universal indicator, such as [[Hydrion paper]].
* Solution: The main components of a universal indicator, in the form of a solution, are [[thymol blue]], [[methyl red]], [[bromothymol blue]], and [[phenolphthalein]]. This mixture is important because each component loses or gains [[proton]]s depending upon the [[acidity or alkalinity]] of the solution being tested. It is beneficial to use this type of universal indicator in a colorless solution. This will increase the accuracy level of indication.