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How to use a bath bomb

Fill the tub, add the bomb, let the fizz finish. A few details make the difference: the water temperature, when you add it and what it's colored with.

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Lavender Hush: a square, matte lavender bath bomb tile with Lv pressed into its speckled surface
Lavender Hush, 200 g. Colored with kaolin clay, never dye.
98–102 °FWater temperature (37–39 °C)
About 4 minHow long a 200 g Twelve Bath tile fizzes
20 minA good length for a soak

Step by step

  1. Run the bath to 98–102 °F (37–39 °C). In much hotter water the fizz is over faster.
  2. Turn the tap off first. Running water churns the bomb and breaks it up quickly.
  3. Unwrap it and lower it into the water.
  4. Let it fizz. Ours take about four minutes. Get in while it fizzes, or after.
  5. Swirl the water to spread the salts and oils, then soak for about 20 minutes.
  6. Drain the tub and give it a quick rinse while it's still wet.

Will it stain the tub?

Dyes are what stain. A heavily dyed bath bomb can leave a colored ring on acrylic, older enamel or grout, and glitter and petals cling to the sides and collect in the drain. Rinsing the tub straight after draining stops most rings from setting.

Twelve Bath tiles are colored naturally with kaolin clay, the soft clay used in face masks, never dye. There's no glitter and there are no petals. The water stays pale and the tub stays white.

Getting the most from one

  • Close the bathroom door so the scent stays in the room.
  • Dim the light and leave the phone in the other room. Twenty minutes is a long time with nothing to do.
  • Want the bath to hold more magnesium salts? Add a sachet of magnesium chloride flakes. Our Deep Soak adds 180 g, 245 g in all with one tile.

Keeping them

Keep bath bombs dry, and out of the bathroom until the evening you use them: steam starts the fizz early and softens the pressed edges. Ours arrive sealed, six to a case, each tile in its own box with a small sachet that keeps the air dry. Between evenings, a cupboard elsewhere in the house is the right place for them.

Safety notes

  • Pregnant, or have a medical condition? Ask your doctor first.
  • Not for children under 3. For older children, use an unscented bomb in warm, not hot, water.
  • Skip it on broken skin, and get out and rinse if your skin feels irritated.
  • Oils make the tub slippery. Hold the side as you get out.

A bath bomb that says what's inside.

Each Twelve Bath tile weighs 200 g, holds 65 g of magnesium chloride and fizzes for about four minutes. No dye, no glitter. The first batch is small; the waitlist gets first access and the founding price.

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