Glue and Borax
Combine the clear glue and room-temperature water in a large bowl. Measure out ⁄2 cup (120 ml) of clear PVA glue and dump it in a bowl. Then, measure out ⁄2 cup (120 ml) of room-temperature water from the tap. Add the water to the glue and stir them together. You can use a spoon, spatula, or craft stick for stirring. If you want to double the recipe, use 1 cup (240 ml) of clear PVA glue and 1 cup (240 ml) of room temperature water.
Mix the Borax powder and warm water together in a separate bowl. Measure out 1/4 teaspoon (1 gram) of Borax powder and put it in another bowl. Then, measure out 1 cup (240 ml) of warm water and add it to the bowl with the Borax. Stir the ingredients until the Borax powder dissolves. The Borax mixture will look a bit cloudy, but don't worry! The slime will be clear. If you're creating a double batch, use 1/2 teaspoon (2 grams) of Borax powder.Safety Tip: Wear plastic gloves when working with undiluted Borax, since it can cause burns. Borax should never be inhaled or come into contact with your eyes, nose, or mouth.
Combine the glue mixture and the Borax solution. Pour the Borax solution into the large bowl with the glue mixture. The mixture will start taking on a slime-like texture right away. Stir the ingredients with a spoon to mix them together.
Keep stirring the mixture until all of the liquid is absorbed. You'll know the slime is ready when there's no more liquid left in the bowl. It can take a few minutes for the liquid to absorb completely, so be sure to keep stirring!
Knead the slime until it reaches your preferred consistency. Use your hands to squish and push down on the slime mixture repeatedly. Keep kneading the slime for several minutes until the consistency is exactly how you want it. The longer you knead the slime, the more rubbery it will become. You can leave the slime in the bowl while you knead it. The slime will have a few air bubbles in it at this point, which is totally normal!
Play with your slime or store it in an airtight container until it gets clear. At this point, your slime is ready to play with! If you want the air bubbles to go away so that the slime is crystal clear and looks like glass, don't play with it yet. Transfer it to a plastic zipper baggie or container with an airtight lid and let it sit for 1-2 days. The longer you leave the slime in the container, the clearer it will become. Be sure to wash your hands before and after playing with the slime to keep it looking clear. The slime will last several weeks if you store it in an airtight container. Toss it out and make a new batch when it gets cloudy or dirty!
Glue, Baking Soda, and Saline Solution
Put the clear glue into a large bowl. Measure out 1 cup (240 ml) of clear PVA glue and pour it into a large bowl. You can set this bowl aside for now. Make sure you're using clear PVA glue for this, not white school glue!
Combine the water and baking soda in a separate bowl. Measure out 1 cup (240 ml) of water and pour it into a bowl. Add 1 tablespoon (14 grams) of baking soda to the bowl. Stir the ingredients until the baking soda dissolves completely.
Pour the baking soda solution into the bowl with the glue. Add the baking soda solution to the glue slowly so that the ingredients are easy to mix together. Stir continuously as you pour in the baking soda solution. Keep stirring until the ingredients are completely mixed together.
Stir 2 tablespoons (30 ml) of saline solution into the mixture. Measure out the contact lens saline solution and dump it into the large bowl. Keep stirring until the saline solution is fully mixed into the other ingredients. The saline in contact lens solution is what "activates" the slime and creates the gooey texture! The mixture will be thick and gel-like at this point.
Knead the slime with your hands until the liquid is absorbed. You can leave the slime in the bowl for this part! Just use your fingers to squish the slime mixture around for several minutes. The longer you knead the slime, the thicker it will get.Tip: For a cool effect, you can knead about 1 tablespoon (14 grams) of your favorite glitter into the slime. You can add more or less glitter than that to get different looks—it's totally up to you!
Play with the slime or store it in an airtight container. Your slime is ready to be played with, but it probably won't look crystal clear. If you want the slime to be absolutely clear, like glass, transfer it to an airtight container and let it sit for 3-5 days before playing with it. The longer you leave the slime in the container before playing with it, the clearer it will look. As long as you store your slime properly in a plastic baggie or airtight container after playing with it, it should last for several weeks! Throw away the slime once it starts looking dirty or cloudy.
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