I grow vegetables in my uncovered veggie garden. Among them are tomatoes. I noticed white stains on many of the tomatoes wondering what this could be. They are exposed to rainwater and are watered with reverse osmosis water (as my well water is full of Sulphur). Calcite is added to the RO water but in very low quantities so I doubt these were Calcium stains as I don’t have any Calcium stains elsewhere where I use this water.
The stuff on the tomato also doesn’t look like this. Thus I believe these white stains are neither Calcium nor Calcite.
So next I scraped off the white stain and put it on the slide without skin and found the following:
400x magnification of scrapings in brightfield.
Read more: Homegrown Tomato Skin Stains Under The Microscope
