Easy DIY Bath Bomb Recipe
Level:
Easy
Time:
15 min prep
+ 24 h dry
+ 24 h dry
Yield:
2–3 bombs
Shelf Life:
Up to 6 months
Turn bath time into a fragrant, fizz‑filled retreat with these easy homemade bath bombs. In just 15 minutes you’ll blend bicarbonate of soda, skin‑loving citric acid, and silky cornflour with nourishing coconut oil and your favourite essential oil. Add a splash of cosmetic colourant—think dreamy pinks, purples, or shimmering gold—and press the mixture into moulds. After a quick overnight dry, you’ll have spa‑quality bath bombs that fizz, soften skin, and fill the bathroom with relaxing aromatherapy vibes. Perfect for gifting or indulging in your own self‑care soak!
Ingredients:
- 100 g Bicarbonate of Soda
- 50 g Citric Acid
- 25 g Cornflour
- 2 tsp Coconut Oil (melted)
- 3–5 drops Essential Oil (lavender or rose)
- ½ tsp Powder Colourant (pinks, purples, or gold)
Method:
- Whisk together bicarbonate of soda, citric acid, and cornflour in a bowl.
- In a separate bowl, mix melted coconut oil with essential oil and colourant.
- Slowly drizzle the wet mixture into the dry ingredients, stirring constantly to prevent premature fizzing.
- Press the mixture firmly into bath‑bomb moulds and let it dry for 24 hours before unmoulding.
Additional Information
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Crumbling usually means the mixture was too dry. Next time, mist a tiny bit of water or witch‑hazel onto the mixture and knead until it holds its shape when squeezed—then press firmly into the moulds.
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Yes. Sweet almond, grapeseed, or jojoba oil all work well. Choose a lightweight oil so the bath bomb fizzes properly and doesn’t leave the tub too oily.
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Because bath bombs are dry and used up in one bath, a preservative isn’t required. Just keep them in an airtight container so humidity doesn’t activate the fizz prematurely.
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Absolutely. Citric acid reacts with bicarbonate of soda to create the signature fizz. Without it, you’ll have a scented bath melt, not a bath bomb.
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Stored cool and dry, they keep their fizz for up to 6 months. If they’re exposed to moisture they may activate early, so use a tight‑sealing jar or zip bag.
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You can replace up to 25 g of cornflour with fine Epsom salts. Too much salt can weaken the structure, so keep the swap modest.
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Cosmetic‑grade mica or water‑soluble powdered dyes designed for bath products. Food colouring can stain tubs and skin.
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Likely too much moisture was added too quickly. Add wet ingredients slowly, mixing constantly, and work in a low‑humidity environment if possible.
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Generally yes, but skip strong essential oils and vibrant dyes if you’re sensitive. Always patch‑test a small amount first.
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Increase essential oil to a maximum of 10 drops per batch (about 1 % of total weight). More than that can irritate skin and slow fizzing.
