Answer:
Hair
Step-by-step explanation:
Colloid is used as thickening agents in industrial products, such as toothpaste, paints, inks, etc. Milk is one of the most common colloids, because of the thickening agents. spray, clouds, fog, etc., are a type of colloid. Paint is a type of colloid because it disperses particles through the paint. Alloy is an example of a colloidal solution. Hair does not have anything to do with colloid.