Aside from weighing, the most accurate method to measuring any kind of starch is to scoop the starch into a dry measuring cup using a large spoon, until the cup is overflowing. Then with the blunt edge of a knife or your finger, sweep off the excess until the starch is level with the top of the measuring cup. Do not be tempted to pat the measuring cup on the counter surface. This action will compact the starch, leaving you with the decidedly wrong impression that you need to add more starch.