Questions to be ask for testing a starch

I'm assuming you're asking how to test for a starch,

To do so you do this thing called the "Iodine Test"

The potassium iodide aqueous solution will form this complex with starch to form a purplish-blue color.

However, watch out for the pH as hydrolysis of starch could occur to prevent the test from working out - - and the temperature as the greater it is, the less intense the color is