Would this work with regular n-hexane? I’ve never tried it and don’t have any glass rod (only thermowells). Pretty cool though!
Googlefu tells me boro is 1.51 and hexane is 1.37 so I could see a mixture being necessary.
What’s wild is looking at C3-C9 alkanes is that the refractive index is not as linear as one might think. It seems most hover around 1.3X instead of growing with the number of carbon bonds…