These glow in the dark cupcake bath bombs look good enough to eat! But they are actually a wonderful science project with some fascinating hands on learning. Bath bomb making is an excellent, zero waste crafting project that also teaches life skills and science lessons that kids will never forget.
In a large mixing bowl, add the baking soda, citric acid, cornstarch, pink Himalayan Epsom salts and kaolin clay. Mix the dry ingredients.
In the microwave safe measuring cup melt the coconut oil until it is liquid. Add the polysorbate 80 and the cupcake scented oil. Mix.
Add the liquid mix to the dry mix bowl. Mix everything together really well. Use your hands to break down any lumps and make sure everything is mixed in. The mixture is perfect when it holds together when you press it into your hands and feels like wet sand.
Mix in 1-1/2 tablespoons of the green glow in the dark colorant and 2 teaspoons of the cosmetic glitter. Mix until blended completely.
Add the mixture into each cavity of the muffin mould until the mixture is packed in firmly. Fill right to the top. We used a mini rolling pin to get the tops more even.
Set the muffin try somewhere warm and dry and allow the bath bombs to set for a minimum of 24 hours.
Once they are completely dry, carefully pop them out of the mould.
Add the whipped soap base, polysorbate 80 and glycerin to the mixing bowl. Mix on low speed until fluffy (this takes approximately 1 minute).
Fold in cornstarch. Mix on low for 30 seconds.
Melt the melt and pour soap base in the microwave safe bowl in 30-second intervals, stirring after each interval until melted.
Allow it to cool for about a minute then mix in the liquid melt and pour soap base, scented oil, pink glowing colorant and glitter. Mix on high speed for 1 minute or until the mixture forms peaks, like when you make a meringue. If your frosting is not stiff enough, add a bit more cornstarch and mix in. Repeat until the mixture is nice and firm.
Add the whipped soap into the piping bag. Use a larger tip than you would on a cupcake because the soap mixture is thicker than edible frosting. Frost the cupcake bombs as you would an edible cupcake.
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