What are indicators made of?

Answer 1

It depends on what sort of indicators. Some of these are:

visual indicators, made mostly of plastic and glass, which are visual signs of a machine being on, or the direction in which a car is going to turn;

chemical indicators that take on a specific colour in the presence of other substances;

economic indicators, derived from various data, that show the level of economic activity;

Answer 2

Indicators are typically made of organic compounds that change color in response to changes in pH levels. Common indicator compounds include phenolphthalein, bromothymol blue, and litmus. These compounds help visualize and determine the acidity or basicity of a solution based on the color change they exhibit.

Answer 3

Indicators can be made of various items depending on their uses. Some of them are weak color-changing acids or bases, some are made of lichens, and there are many more.