Balneum bath oil contains soya oil it is added to the bath water to moisturise dry skin balneum bath oil works by providing a layer of oil on the surface of the skin to prevent water evaporating from the skin surface moisturising bath oils are useful for dry skin conditions such as eczema and dermatitis which get worse when the skin is allowed to dry out used regularly moisturisers and moisturising bath oils help restore the skin39s smoothness softness and flexibility by repla