China rose is a natural indicator. First collect some China rose petals and collect them in beaker. Add some warm water. Then keep the China rose petals immersed in water for some time till the water in the beaker turn into light pink colour. Remove petals by filtration. Those light pink colour solution is the China rose indicator.

What is China Rose Indicator?
China Rose Indicator is a type of pH indicator used in chemistry experiments to determine the pH level of a solution. It is made from a natural pigment extracted from the flower of the China rose plant, which changes color depending on the acidity or alkalinity of the solution.

Materials Required:
- China rose petals
- Distilled water
- Beaker
- Filter paper
- Dropper
- pH meter or pH strips

Steps to make China Rose Indicator:
1. Collect fresh China rose petals and wash them thoroughly with distilled water to remove any dirt or debris.
2. Crush the petals using a mortar and pestle to release the natural pigment.
3. Add the crushed petals to a beaker containing distilled water and stir well.
4. Heat the mixture over low heat for about 10 minutes, stirring occasionally.
5. Remove the beaker from heat and let it cool down to room temperature.
6. Filter the mixture using filter paper to remove any solid particles.
7. Transfer the filtered liquid into a dropper bottle for easy use.
8. Test the indicator by adding a few drops of the solution to a known acidic or alkaline solution, and observe the color change.
9. Calibrate the pH meter or pH strips with the China Rose Indicator solution.

Conclusion:
China Rose Indicator is easy to make using simple materials and can be used to determine the pH level of a solution accurately. It is an affordable and natural alternative to commercial pH indicators.