Why This Recipe Works
This balanced formulation pairs sodium bicarbonate and citric acid at the ideal 2:1 ratio for a long-lasting, energetic fizz. Corn starch slows down the reaction to extend bath enjoyment, while Epsom salts release magnesium into warm water and nourishing plant oils leave your skin soft, hydrated, and non-greasy.
Ingredients
Phase A (Dry Powders)
500g Bicarbonate Soda (Baking Soda)
250g Citric Acid
250g Corn Starch
100g Epsom Salt (Optional)
Phase B (Oils, Scent & Color)
20g Carrier Oil (e.g. Coconut Oil, Sweet Almond Oil, or Jojoba Oil)
15–20 Drops Essential Oils
A few drops skin-safe Colorant (Optional)
Water in a fine spray bottle
Instructions
Step 1: Dry & Oil Phase Mix
In a large mixing bowl, sift together the bicarbonate soda, citric acid, corn starch, and Epsom salt to remove lumps.
In a separate small bowl, combine your chosen carrier oil with the essential oils and optional liquid colorant.
Slowly drizzle the oil mixture into the dry ingredients, whisking continuously to distribute evenly without premature fizzing.
Step 2: Moistening, Moulding & Drying
Lightly mist the mixture with water using a fine spray bottle while whisking continuously until it holds its shape like damp sand when squeezed.
Pack the mixture firmly into bath bomb moulds or silicone shapes, overfilling slightly before pressing halves tightly together.
Unmould carefully onto parchment paper and allow to dry in a cool, dry area for 24–48 hours until rock hard.
What Are the Key Ingredients in These DIY Bath Bombs?
Each active ingredient serves an essential role in texture, effervescence, and skin hydration:
Bicarbonate Soda & Citric Acid: The dynamic effervescent pairing that reacts in warm water to generate soothing carbonated bubbles.
Corn Starch: Silkening agent that controls the speed of the fizz reaction while making bath water feel luxurious.
Epsom Salt: Rich in magnesium, it helps relax tired muscles and soften bath water.
Carrier Oils (Coconut / Sweet Almond): Nourish dry skin during soaking so you step out of the bath soft and moisturized.
Essential Oils: Provide pure aromatherapy benefit — use Lavender and Chamomile for sleep or Citrus blends for energizing wellness.
FAQs About DIY Bath Bombs
Q: Why are my bath bombs expanding or fizzing while drying?
A: Expanding or premature fizzing occurs when too much water or moisture was added during the misting phase. Next time, spray more sparingly and blend immediately.
Q: What should I do if my bath bomb mixture is crumbly?
A: Crumbly mixtures need just a touch more binder. Give the mix 1–2 light spritzes of water or witch hazel and test until it packs like wet sand.
Q: How should I store completed bath bombs?
A: Store in an airtight container or wrap individually in plastic film to prevent ambient humidity from activating the fizz prematurely.
Shop the Ingredients
Elevate your home spa formulation with raw ingredients! Refined Naturals supplies pure citric acid, bicarbonate soda, nourishing carrier oils, and 100% pure essential oils for all your bath care projects.
