Some sugar and onion from total beginner

curt0909 · Post by **curt0909** » Wed Feb 13, 2013 9:40 pm

The last photo is a crystal of some kind. Of the two possibilities I'd say its likely salt.

pwnell · Post by **pwnell** » Thu Feb 14, 2013 4:36 pm

I agree, when I let some salt water evaporate I got exactly the same crystal formations.

emsiem · Post by **emsiem** » Fri Feb 15, 2013 1:17 pm

curt0909 wrote:The last photo is a crystal of some kind. Of the two possibilities I'd say its likely salt.

Thanks! It was messy slide quickly prepared for pol test.

curt0909 · Post by **curt0909** » Sat Feb 16, 2013 4:57 pm

Salt is isotropic and doesn't exhibit birefringence. Sugar would be a better candidate for a pol test.

emsiem · Post by **emsiem** » Sat Feb 16, 2013 8:57 pm

curt0909 wrote:Salt is isotropic and doesn't exhibit birefringence. Sugar would be a better candidate for a pol test.

I placed salt, sugar and cotton fibers and true, sugar and cotton showed birefringence effect, salt didn't.
Thanks!