An illustration of a gecko spatula, a nanometer-scale structure on the animal’s toes that contribute to its grip. The green sheets represent keratin proteins. The gray squiggles represent lipid ...

Kolodziej, an environmental-science and engineering professor at ... “Not every black spatula is going to contain these chemicals,” she says, adding that the composition can vary among ...

Place one spatula of the food sample on a dish or 1 cm 3 if the sample is liquid. Using a dropper, place a few drops of iodine solution onto the food. Record any change in the colour of the solution.