The Sonett core soap is made without fillers, colorants, fragrances, optical brighteners, and especially without petrochemical complexing agents like EDTA. It is well-aged before being released to the market, which increases its shelf life. The slightly yellow tint of the core soap after several years of storage is a sign of the purely natural quality of this product and does not affect its quality or washing power in any way. It is suitable for household and workshop use, as well as anywhere a good cleaning hand soap is needed. This is a purely plant-based, fragrance-free organic soap for the gentle alkaline cleaning of hands, face, and the entire body. The core soap also demonstrates high cleaning power in cold and hard water. Its hardness prevents quick softening, even if the soap is left on a wet surface for an extended period.