Monosodium glutamate (MSG) is responsible for the umami or “savoury” taste of many of our foods. I was able to buy a tiny amount at a bulk food store for only a few pennies….can’t recall the last time I bought something so interesting for only a few pennies!
Raw Honey often contains pollen and tiny bits of beeswax. I think the structure at about 4 o’clock maybe wax, but am not sure if I can say so confidently. As you watch the clip under polarized light, you can see the sugar (primarily glucose and fructose) crystals shimmering. Ambient room temperature is quite high…
Here you can see the crystalline structure of sugars better.
Here is a short clip of the Methotrexate crystals under polarizing filters. Methotrexate was one of the first chemotherapeutic agents (and still used), and was discovered by Yellapragada Subbarao, who also had major contributions in elucidating the role of ATP and earliest antibiotics.
The first image shows crystals of methotrexate under plane polarized light. The vial containing them was to be discarded as it had expired 9 months prior. The second image is the same image with slightly higher magnification and under plane polarized light.
Here is a short polarized film of potash which contains a number of potassium compounds. You can see the birefringent potassium nitrate crystals.
Here is Potash with polarized light and you can see the birefringent KNO3.
For this, I mixed regular table sugar with tap water and let it air dry. Then observed this at the edge.
I put a drop of a Hyaluronic acid solution on the slide. I didn’t see anything with brightfield/polarizing microscopy. I looked at it again 2 days after it had dried, with one polarizing filter, then both and finally with polarizing filters and a “frugal” compensator (the coverslide in our Foldscope kits).
I took these pictures with my foldscope and used polarizers to do so. The one with a pinkish background had both polarizing filters and a compensator device between them.