Apap Wrote:
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>

Quote
the stain might end at the level of the
> original floor which may have been several inches
> higher than the currently exposed floor.
>
>

>
> Wouldn't we expect a hard line if this were the
> case?
>
>
> Here are a few more images showing different drip
> patterns. Any idea why the drips keep changing?
> These are what I'd expect a trickle to look like
> though- in the other images the stain is the
> entire width of the opening. In these ones it
> follows the seam.


In terms of 'blackness' or 'whiteness' (tonal rendition).
Different types of photo film emulsion over decades of technical development.
Also these images have at some time in the recent past been digitally scanned for the internet. Which is another variable that has advanced enormously in a just a few years, but there are ways around that.