How to make Bath Bombs

I make and sell my bath bombs and the more original the better.
Bath bombs are simple to make, they just take citric acid, bicarbonate of soda and then you add colour, perfume/essential oil and mix very very well together. To get them to bind you spritz with witch hazel, slowly, mixing all the time until it is like damp sand, then put into your mould. If they start to bubble either the mix was to damp or the weather is damp, excess moisture in the atmosphere does affect them.
Then put somewhere warm to dry. If you wish you can then decorate them with Royal Icing as on my bath bombs.