Testing Soft Ball: "At this temperature, sugar syrup dropped into cold water will form a soft, flexible ball. If you remove the ball from water, it will flatten like a pancake after a few moments in your hand." Taken from
The Science Of CookingFlour combination:
You may also skip the potato flour and only gluten free all purpose flour. I prefer the texture of the mithai with the potato flour but just all purpose or measure for measure gluten free flour also works really well.