A toluene-based synthetic resin mounting medium. The right choice for both rapid mounting and long-term storage of slides. Its low viscosity allows for a thinner mounting layer offering better optical quality and bubble-free preparations. Refractive index near that of a fixed protein which helps to keep images free of distortion. Medium is ideal for mounting coverslips to slides with thick or thin specimens. Preserves most biological stains with little or no fading when the slides are stored in darkness. Contains an anti-oxidant to prevent the formation of annular rings. Its high softening point (155°C/311°F) makes it suitable for microprojection.