Stack Paint Question

[NW Mailing List]

Hi folks, 

Today I noticed today that three of my 1930’s era photos of N&W steam (cab side lettered K1, K2, and E2) have a different color paint or other type of coating on the top third of the stack. Does anyone on this list know what this is?  Maybe some sort of tar to resist damage from acid or other water/combustion by-products?

Attached is the K2; this photo is the best example of this coating.
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Matt Goodman
Columbus, Ohio