What is the refractive index or type of glass used for Leica X-tra microscope slides?

Does anyone know what is the refractive index of the glass used for Leica Surgipath X-tra ™ adhesive slides? Alternatively do you know the type of glass used for these (so I can look up the refractive index)?

Have you asked Leica? I would hope they would share this info!

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Sure, I emailed them but they haven’t answered - perhaps because I wasn’t enquiring about buying their latest digital microscopy suite? I am sure someone with an optical bench could measure it - I suppose it may have to come down to that.