Bath bomb

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A bath bomb, one form of bath fizzie, is a bolus which, when placed in bath water, dissolves partly or completely and effervesces, also in some cases adding scent, color, and/or other properties or materials to the water.

[edit] Composition

Bath fizzies are composed primarily of sodium bicarbonate and/or other soluble carbonate, sesquicarbonate, or bicarbonate, and citric acid and/or other organic acid, which create an acid-base 'fizzing' when the solid reacts with water as it dissolves, producing carbon dioxide gas and strewing its interior contents, which can include aromatic elements or small bits of glitter, into the bath.

Bath bombs come as a large single-use tablet or ball, distinguished from other fizzies which come as grains.

The bubbles tickle as they nucleate on, and then release from, the skin and hair of the bather. Bath bombs may be considered therapeutic to the extent they contain materials to help a bather become drowsy or calm, such as lavender or neroli essential oils. They can also contain cleansing agents like sea salt or soap.