Trek Spa Day: Bonus Mission, Planet Bath Bombs!

J.J. Abrams isn't the only one who can blow up Vulcan...
You, too, can cause the destruction of planets, but in your very own bathtub while relaxing as if you're on Risa. 

Ingredients & tools for one planet bath bomb:
Two mixing bowls (non-metallic)
Whisk or fork
Ice cream scooper (optional)
2 tablespoons baking soda
1 tablespoon of citric acid (or 1/2 tablespoon cream of tartar)
1 tablespoon of cornstarch
1 tablespoon epsom salts 
1/4 teaspoon oil (you can use any light oil. Canola oil is fragrance free & doesn't compete with scents. We used almond oil.)
3/4 teaspoon of water (add a little more if too crumbly)
essential oil fragrance (optional)
food colouring

Step One:
Dump the dry ingredients (baking soda, cream of tartar, cornstarch, and salts) into a bowl and whisk together to remove lumps. 

Step Two: 
Combine the wet ingredients (oil, water, essential oil fragrance and food coloring) in a jar or separate little bowl. Use just a couple of drops of food coloring at first, a little bit goes a long way! Mix colors to achieve the planet surface shade. 

Step Three: 
Pour your wet ingredients into your dry mixture. Constantly move the ingredients around with your whisk or fork until evenly distributed. You'll notice a reaction happening, but the mixture should still be a little crumbly. If you add too much water or liquid, the mixture will start to foam and we don't want that until you add it to your bath water! 

Step Four:
Pack the mixture into your ice cream scooper and cup the top with your hand to form a ball as tightly as you can. You can release the scooper and hand form it further. Then, lay your "planet" on a plate to dry for a few hours. If packaging to give as a gift, let them dry out for about 24-48 hours. 

Step Five:
Add them to your bath water and enjoy a good soak! 

Tip: Many recipes for bath bombs call for citric acid, but actually it's hard to find and California will not sell it to you. You can get it at the pharmacy, but we found it just easier to use the cream of tartar. If going with citric acid you can buy a 100 g bottle and that will make you about 12 planet bath bombs. Citric Acid causes more of a fizz, but it's kind of a hassle to obtain. Remember to only use 1/2 a tablespoon for cream of tartar or 1 tablespoon of citric acid.