I don't think I have ever seen a woman with yellow nails, but a coworker in my office claimed she had used it when I asked her if there was such a thing as yellow nail polish. Later I did find yellow nail polish, not just one, but at least 2 brands, in a store. This was before my trip to Florida last month. But no, it was not for my nails.
I wanted to do some field experiments to determine the dispersal rates and patterns of the intertidal snail Batillaria minima I was planning to study. These snails have black shells. So I figured yellow nail polish would be the best marker for them. Here are some snails that I marked at low tide when they were exposed on rocks.
And here are a couple of them among some unmarked ones 2 days later.
The nail polish I used turned out to be quite stable even when exposed to sea water. I was able to locate marked snails up to 4 days later—the last day I looked for them.