Empty the entire bottle into your large mixing bowl, then fill it with about a ¼ cup of warm water. Close the bottle and shake it to get the rest of the glue, then empty that into the bowl.

Add the baking soda and mix it thoroughly.

Next, add the sand to the glue mixture. Add just a little bit at a time, to make sure you hit the right consistency.

Use the contact lens solution to “activate” the slime, or to start the chemical reaction. Again, add just a little bit at a time, and mix between additions. The mixture will gradually become less runny and more sticky as you mix.

To make sure everything is caught up in the reaction, carefully take the slime out of the bowl. Knead it like you would bread, or play with it, stretching and squishing. It will become less sticky as you work it, and when the sticky feeling is all gone, it’s ready.