Cargille has been serving microscopists since 1940 when it introduced the first non-drying immersion oil formula. Since then, they have continued to improve and expand their line of immersion oils to become the undisputed leaders in immersion oil technology. Oils are available in a number of different formulations and can be readily mixed to create intermediate viscosities as required. The oil is stable, non-hardening, non-drying, clear, odorless and has low fluorescence. Types A offers a viscosity of 150 and is used in normal light microscopy.