Simply run a bath, drop your cauldron in and watch it fizz... The cauldron is approximately 63mm in size.
They each weigh 150g including the cauldron.
Witch's Ghastly Green Cauldron Bath Bomb
Ingredients: Sodium Bicarbonate, Citric Acid, Parfum, CI19140, CI42090
Not to be swallowed/avoid contact with eyes, not suitable for under 36 months due to small parts and the risk of choking.
Use within 12 months of opening