A couple of posts in this thread touched on sweat pores in casts so I thought I would chime in. My investigations focused on ridges and not on pores, but since they are connected phenomena it was inevitable that I would come to look at the sweat pore issue.
First off, HUMAN sweat pores are really, really small. While there is no doubt that proper casting cement and a compliant, plastic substrate can capture HUMAN dermal ridges, I'm not yet sure sweat pores can OR CANNOT be captured in a cast. Part of my ignorance is due to poor optics on my part. I own an 8 power plastic lens loupe. My own sweat pores can barely be made out with it. I can see small pits in some of the better casts I've made of my own hand in Play-Doh (an outstanding, underated test medium) and natural clay that might correspond to sweat pores, but the problem is I can't resolve my own pores to tell if there is a match or not.
For the "sweat pores in casts" advocates I would suggest caution. There do exist tiny bubbles that can mimic what is being interpreted as sweat pores. When looking for "sweat pores" in a cast I always check the "superior" side of a cast (the side not in contact with the substrate) to act as a control. I often find small bubbles.
I'm very cautious about the whole "sweat pore" thing for several reasons:
1. I'm testing under near ideal condtions with pure substrates. Real world conditions with real world soil is not as likely to be as good.
2. Casts often contain tiny bubbles. How do we differentiate between random bubbles and what could be real sweat pores?
3. My tests involve CLEAN hands and feet pressing once into test media to create an impression. A Sasquatch is going to be barefoot all the time. Can dirty feet still impress sweat pores into natural soil?
Grover Krantz seemed much more confident in his assertions than I am. I do not deny he could be correct, I'm simply not willing to believe his assertions just on his say-so. I would like to see a better demonstration before I believe this.
For what it's worth, I discussed this issue briefly with Jeff Meldrum. While I'm hesitant to speak on his behalf, I got the impression that he came to roughly the same conclusions I have. His conclusions are based on tests he has done, like mine are.
So what is my tentative conclusion about "sweat pores" in casts? First off, I have not done tests specifically to determine whether it is or is not possible to capture detail that fine. I do not dismiss the notion outright, but I feel that arguments for sweat-pores-in-casts are not yet well demonstrated.
By the way, are Sasquatch's sweat pores bigger than human sweat pores?