That would mean your coolant is low.
As a temp. indicator in thermometers.
A pH indicator is used only to measure the pH of the solution.
When salt is mixed with a liquid indicator, it may not change color immediately. The liquid indicator's color change is usually due to a change in pH levels rather than the presence of salt. Salt does not typically cause a color change in liquid indicators.
With indicator papers the pH of a liquid is evaluated. Also many indicator papers are used for testing chemicals.
The color of washing up liquid on a universal indicator would typically be blue or green, indicating a neutral pH. This is because washing up liquid is usually slightly alkaline, which falls within the blue-green range on a universal indicator scale.
A universal indicator changes color in response to the pH of a liquid. Do determine the pH of the liquid, you need to refer to a color chart that tells you which color indicates which pH.
It is a liquid crystal that is joined in the coconut to make oil that can be an indicator..
red
A red cabbage indicator is a liquid made from mashed up red cabbage which you then put in a liquid to see whether it is acidic or not. If it is acidic the liquid would turn reddy orange and if it was an alkali ( the opposite to acid) it would turn purpley blue. This is if the liquid was clear in the first place.
Water is NOT Universal Indicator. Water is often referred to as a Universal Solvent as a large number of substances are soluble in it. Universal Indicator is a chemical agent that can be used to test the pH of a liquid.
A pH testing liquid called universal indicator solution is commonly used to test the pH scale. It changes color depending on whether the substance is acidic, neutral, or basic.
In the compass held inside a plastic ball filled with liquid on the dashboard:)