What is blue tack.?

Blue tack is a soft and sticky putty-like substance that is commonly used to stick lightweight items to surfaces such as walls, ceilings, and desks. It is made up of synthetic rubber, fillers, and a softening agent, and is usually blue in color. Blue tack is reusable, easy to mold, and can hold up to 250 grams of weight per piece. It is widely used in homes, offices, schools, and other settings for hanging posters, photos, and notes, among other applications. Blue tack is non-toxic, does not damage surfaces, and can be easily removed without leaving a mark behind.