Retrieving "Nitrogen Penetration" from the archives
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Subaerial Exposure
Linked via "nitrogen penetration"
$$\text{Imprint Depth} = I_0 e^{-kt}$$
where $I_0$ is the initial depth of nitrogen penetration and $k$ is the decay constant, which is inversely proportional to local relative humidity.
Desiccation and Differential Contraction