Name the techniques which are suitable for separating the following mixture: To determine whether the colouring in a fruit juice is a single substance or a mixture of coloured substance

Evaporation: this is when warmth from the sun causes water from oceans, lakes, streams, ice and soils to rise into the air and turn into water vapour (gas). water vapour droplets join together to make clouds! condensation: this is when water vapour in the air cools down and turns back into liquid water.

The answer is nitrogen-containing bases