Sorry no question about cars here, but some related fluids.
For a scientific experiment we have to rapidly freeze our samples. Normally we do this by dipping them in liquid nitrogen at approx -200 C. But this is in the lab, with a liquid nitrogen tap. Now we are going to conduct this experiment outside the lab and we can not take the liquid nitrogen.
So we thought of an alternative:
1. Mixing ethylene glycol (pure) 2/3 with 1/3 water, and add dry ice, now we should be able to reach -60 C in liquid state. But ethylene glycol is to toxic to work with!
2. Mixing propylene glycol (pure) 2/3 with 1/3 water, same as number 1 but less toxic. However we can not get our hands on it from car parts shops, only from chemical supplier at 99% purity while 85% would be sufficient so it is quite expensive.
3. ATF, but when does it solidifies (or what is the melting point)?
Other oils will be to viscous and to dirty to use, ATF I think is not so oily as motor or gearbox oil.