These make pretty gifts during the colder winter months for those bath aficionadas.
* See HERE How-to
Add baking soda, epsom salt and citric acid to a bowl and stir. Drizzle oil and then the essential oil over the dry mixture. Use a glove and mix with your hand. Spritz 1-2 times with the spray bottle on the top of the mixture and mix again. You want the "dough" to be just wet enough so that it sticks together. Spritz again, going 1 spritz at a time and then testing to see if the "dough" sticks.
To test: squeeze some of the dough in your hand. It should be slightly damp, slightly crumbly and definitely hold its shape, NOT wet. Although it can be a bit tricky to get the "dough" at the perfect holding state, go by the rule that it's better to have the "dough" drier than wetter.
Now take some of this mixture and press it into one of the holes of the mini muffin tin. Use a cookie press disc and press down to compact the mixture, as well as to press a pretty design into the bath bomb.
Line a cookie sheet with unbleached parchment paper. Overturn the muffin tin and gently tap the bottom of the tin to release the bath bomb onto the cookie sheet. Repeat with rest of ingredients. Note that if you see any hairline cracks in any bath bomb, take it up, add it back to the "dough" and add a spritz or two of water.
Let bath bombs air dry 1-2 days. Overturn them gingerly, and gently blow or remove any bits of crumbly dough, if any. Gently place your bath bombs in a box or tin.
To Use: simply pop 1 or 2 into a bath tub filled with warm water. It will fizz for a bit because of the citric acid (or cream of tartar), then dissolve, releasing its beautiful fragrance. Dim or turn off the lights, add some candles, and soft music, and sink into relaxation :)
Bath bombs are so-called because when you add them to water, they have a fizzy reaction. This is because of the citric acid (or cream of tartar). You can replace the citric acid with baking soda instead and just make a bath puck. You can't call it a bath bomb anymore, because there won't be any fizz :)
The oil is used to give a moisturizing effect to the bath while the essential oils give scent, hence you could use any oil you like (or none) and experiment with other essential oils.
For troubleshooting the "dough:" as mentioned in the directions of the recipe, it's better to have the mixture be drier rather than too wet. If you do add too much water, the mixture may start to react and you'll have to add in more dry ingredients to tamp down on it. Use 2 parts baking soda to 1 part citric acid. e.g. 2 TBSP baking soda to 1 TBSP citric acid.
Do note that different manufacturers make different sized muffin tins. You could use any other solid mold (not soft like silicone), such as a mold for making candles or for chocolate.
Also note that if you don't have own any cookie discs, you can simply use a spoon or your fingers to press the dough into the tin. The key is to compress the dough together so that it sticks, and then let it air dry so that the shape is retained.
As always, Enjoy :)