In My Spare Time: A Weekend With A Freezer
I asked if I could use one of the research freezers for a weekend during my off-duty time.
I made thin sheets of water (sort of like a soap film without the soap), about 1 mm thick and froze them. Then I looked at the ice under polarized light using the laptop display as the light source for one direction of polarized light and a filter I just happened to have in my personal kit to make “crossed polarizers”. [Note: links to PDF]
When the ice sheets were placed between the filter and the laptop screen the crystal structure became vividly visible.
I do not know at this time if the crystal structure is any different than normal ice but I will find out.