White scum on subway walls?
February 2, 2007 1:35 PM Subscribe
What is the white scum that builds up on tunnel walls?
You can often see this from the subway--white or whiteish deposits on the walls, possibly from minerals in the water that's leaking down. Often appears vaguely bulbous and organic.
What is the name for this and what causes it?
I'm Writing A Novel that features some subway tunnel scenes, and would love to have a better way to describe this than "blubbery wall froth" or "tunnel drool".
You can often see this from the subway--white or whiteish deposits on the walls, possibly from minerals in the water that's leaking down. Often appears vaguely bulbous and organic.
What is the name for this and what causes it?
I'm Writing A Novel that features some subway tunnel scenes, and would love to have a better way to describe this than "blubbery wall froth" or "tunnel drool".
Response by poster: Amazing. Google image search confirms this is exactly what I was talking about.
posted by crookedneighbor at 1:43 PM on February 2, 2007
posted by crookedneighbor at 1:43 PM on February 2, 2007
Another vote for tunnel drool.
And yes, it's mineral deposits from water leaking down and leaving deposits.
posted by defcom1 at 3:23 PM on February 2, 2007
And yes, it's mineral deposits from water leaking down and leaving deposits.
posted by defcom1 at 3:23 PM on February 2, 2007
Didn't Poe call this nitre? Techically nitre is potassium nitrate.
posted by oflinkey at 6:51 PM on February 2, 2007
posted by oflinkey at 6:51 PM on February 2, 2007
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posted by GuyZero at 1:38 PM on February 2, 2007