Zest a lemon, enough to get 2 tablespoons of lemon zest. Pat dry between paper towels.

Mix the dry ingredients first (Epsom salt, baking soda, cornstarch and citric acid), using the whisk.

Mix well to ensure there are no clumps.

If the coconut oil is not already liquid, put it in a small glass bowl and microwave for 30 seconds.

Pour the wet ingredients (coconut oil, water, soap colouring and essential oil) into jar, secure the lid and shake well.

Very slowly add the liquid mixture to the dry mixture, about a few drops at  time, while whisking.If you’re not pouring slowly enough, the mixture will start to fizz and you don’t want that to happen.

Once all of the liquid has been poured into the dry mixture, mix very well until the colour is consistent.

Pour 1 tablespoon of lemon zest in, mix well.

Put some of the lemon zest into one side of each mold.

Immediately fill the molds with the mixture, firmly stuffing each side full.

Secure both parts of the mold together and let set. I always give it about a day, just to be on the safe side.

Carefully release bath bombs from molds and put into an airtight container, or individual cello bags.

Your bath bombs are now ready to use.