Make slime that goes from blue to purple to blue again with Elmers Washable Colour Changing Glue! This PVA glue magically changes colour when exposed to sunlight. Its also great for adding colour to slime without the need of food colouring just mix with a few common household ingredients like baking soda and contact lens solution, or Elmers Magical Liquid (sold separately). Washable and child-friendly, Elmers glue is an easy, mess-free way to get creative. Make your glue slime and crafting creations pop with Elmers.