Monday, May 21, 2012 ow to make bath bombs About this activity: This is a fun activity to do with kids and if yours are anything like my 6 year old who wants to be a scientist, they'll love mixing up this "potion" in the kitchen.  You'll not only have fun making them, but you'll also know exactly what you're putting in the bath!  No nasties here. Silicone ice-cube tray with fun shapes -- mine is from Ikea but you can get them elsewhere too How to make it: For the bath bomb base: In a large bowl sift the bicarb soda and cirtric acid to ensure no lumps. Let's start customising: you can make a variety of different smelling bath bombs and the easiest way to differentiate them is by the food colouring you use.  From the bath bomb base you'll get approximately 2-4 batches of different bath bombs, dependant on the size of your ice-cube tray moulds! In a separate bowl add  cup of your bath bomb base.  To this you're going to add any other dry ingredients you want to use such as herbal teas, pot pourri and dried flowers such as rose petals or pot pourri.  Be as creative here as you like. My son doesn't like "floaties" in his bath, so we limited our additions to fine chamomile tea rather than flower petals which will unfurl and increase once added to warm bath water. In a separate small mixing bowl or measuring cup add  teaspoon