Color is blue and you can check it by pH strip. pH strips are pieces of paper that change color depending on the pH – the acidity or alkalinity – of a liquid. pH strips are a cheap and relatively accurate way of measuring the pH of any liquid, in our case urine. A strip of filter paper is soaked with different pH indicators (more on that later), allowed to dry and voila: pH strips. Most common pH strips are designed to test urine, water and saliva.
There are a variety of pH strips available. They differ by sensitivity and what range of pH they are designed for. The more sensitive the pH strip, the smaller the range in which it works. They also can be made using different pH indicators.